Restore Silver with Electrochemistry 2017
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- Опубликовано: 3 окт 2024
- In this video we restore s silver metal coin with electrochemistry.
Old silver is often tarnished by a thin layer of silver sulfide that appears as a brown color. The silver sulfide can be electrochemically converted back into pure silver if a negative potential is applied.
To do this, first make a solution of 200mL water and 20g sodium chloride (salt) with 10g sodium bicarbonate (baking soda). They won't completely dissolve but this is acceptable. Then simply place a silver object in the solution and contact it with a large piece of aluminum foil. In a short time the silver will be restored.
A very cool way to do the same thing is to use a battery. Connect the negative end of the battery to the silver and the positive end to a large electrode, like a copper plate, and dip them both in the solution.
This process occurs due to electrochemical reduction of the silver sulfide to silver.
Related videos:
Restore silver by electrochemistry 2009: • Cool Science: Restore ...
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Any of my old videos that you think i should redo?
NurdRage do your video on making nitric acid! I loved that one!
NurdRage magnetic salts!!!
Plz
What about the Hydrazine sulfate one?
Pyrimethamine! :P
Just cleaned all of my grandfathers old coins. He will be so pleased.
Lmao
😆
dread emoji
You gotta warn people about the smell! Doing that reaction releases malodorous sulfur compounds. It’s a good experiment to do outside.
My mother once restored her heritage silver spoons, forks and knives by just boiling them in an aluminum kettle, using just a small amount of ordinary (iodized) table salt in also small amount of our quite hard tap water. The silverware had been tarnished due to little use and no protective paper wraps or anything. Previously they had been occasionally cleaned by some mildly abrasive paste, but that was tedious, one piece at a time. Moreover it removed some of the precious silver. This salt and aluminum method was in effect a bulk operation and also did not consume any of the silver.
Thanks man did this to my mothers silverware set, she was so happy to not be using a rag and buffing compound, did a full set in like 5mins, although she wasnt to happy with the smell of the kitchen afterwards.
OMG Thank you so much for this video. My silver expensive jewellery got very tarnished (turned dark purple bronze colour- was super panicked) in washing powder solution whilst hand washing some soaked clothes. Tried the baking soda solution on foil in a glass bowl with hot water didn't really make a difference.... Started to look online to buy a silver tarnish product.
Came across your video followed your salt/ Baking powder instructions within 10 seconds I kid you not, I couldn't believe it. My jewellery is now gleaming...Thank you so much.I will donate to you the cost of the silver product I was seeking to buy online. Thank you.
What did you do
That was EXTREMELY cool. I had no idea this was a thing, thank you, as always, for your informative and interesting content!
at Robo t Slug - yeah Rob , it was really cool
This man has accomplished what the alchemists wanted to do, turn the sulfer into gold or silver...
this is done by getting rid of the sulfer from the silver and gold coins.. making them like new is the best way to create valuable silver and gold.
if we can market the sulfer or the dirt as intrinsic value then its got more value more value than silver value, but we can pay this for shinny silver or gold coins too.
That reminds me of when I was a kid watching Mr. Wizard. A dramatic effect explained by science. Bravo!
Wish you were my chemistry teacher back in the day! I would have had an A+ instead of a B! Love the content, keep the videos coming!! Thanks!
I wish my chem professors had taught my chem classes the visual way you do in your videos
4:38 I can already see this becoming a trending gif
Lol yup, "over less than 2 seconds" not sure how long that is......
I'm delighted and enlightening by the science. Please don't stop making these types of vids. I really enjoyed it :)
Best silver cleaningvideo I've found. Thanks a bunch
Try the reverse, since the electrical potential is -1.66V you're creating a battery with the tarnish and the aluminum. Try illuminating an LED or something similar with the recreation. The current is probably extremely low but you might be able to get it to work.
Shouldn't the cell voltage be -0.69-(-1.66)=0.97V? That wouldn't be enough to light an LED.
I think he is saying those are two different reactions with two different electrical potentials. So one is 0.69, the other is 1.66, they aren't done at the same time. He used the one with the higher voltage because it works better and is faster for reducing the coin.
Thank you! I just cleaned 15 years of black sulphide from our teapot using this method in a bucket. It worked brilliantly while I found I could 'encourage' the process by rubbing the stubborn parts with bicarbonate powder.
Awesome! i'm glad it worked for ya :)
Your videos are great. I look forward to new ones. I'd suggest covering new reactions rather than revisiting the old. Technical discussion of retrosynthesis would be interesting, as would some heterocyclic syntheses.
Taking a corrosion course currently, this is so interesting. Cheers, man. Loved it!
That is very educational video. It will also make people better understand why steel does not corrode when coated with zinc layer or in contact with a zinc object. Your example is so fast that it is much easier to observe than slow steel corrosion process.
4:35 Moments like that are why I love chemistry. Great video, as usual.
I did this with my kids yesterday. Amazingly easy and fun to watch.
It has been 4 years, have your kids maintained their shiny glow? Or have they begun to tarnish? :)
@@jholland404
😂😂😂
Also did they retain their numismatic value ??
Great video,You don,t waste our time and you taught me a lot very quickly.
Awesomeness happening before our own eyes! Thank you for sharing it.
When he wants you to watch it in 4k but you click too early and watch in 360p 😂
This is amazing, thanks for all the work you put into your videos!
I just did this experiment today, and it is amazing. I use it to clean some of my wife's expensive toys and it worked so nice. I did a small alteration that did increase the reaction speed, a few seconds on the microwave :D that resulted on a reaction as fast as the electrolisis process
This is amazing chemistry in life!!
Perhaps a redo of the "Get Lithium from a battery"?
Yesterday i was In a mineral bath and my silver pendant stained itself instantly, this vid Will be realy useful.
Never thought that just two metals touching each other would be enough to completely get rid of the tarnish.
You always learn new stuff, and the awesome thing is that you get it basically for free.
Thanks for sharing!
Oh forgot one thing, does someone know how to get rid of rust on iron/high carbon steel caused by hydrochloric acid? Tried polishing and rust removing agents but you can still see the orange/brown stuff caused by the HCl. I would highly appreciate it if someone knows how to get rid of it!
Thanks for this, especially 3:57 onwards. If only I'd known about this back in the '80s!
Wow just wow. I must own no less than a kilo of heavy solid silver jewellery that I like spotless. And yes you guessed I hate hate polishing cleaning. So going to try this. Thank you
Please do more videos like this one. Using different chemicals and different metals👍
Nice to see you have a (mostly) new stirbar. :D
That was very cool, it looked like it was oxidizing the copper in your wires too in the battery example
Utterly fascinating! I found several silver items in an old well. They are badly crusted with something - not mud or dirt but something that steel wool won't budge. I am going to try this in the hope it might work.
Did it?
Did it?
Great experiment. I'll be using this on my silver.
Thank you so much for making this video.!!
Applied science is awesome
I'll gladly re-watch any video you want to make again in high quality!
Wow, this is just amazing.
The reaction is so fast.
I think the overall is a little different:
3Ag2S + 2Al + 3OH- + 3H2O = 6Ag + 2Al(OH)3 + 3SH-
ph cca 10-11
SH- + H2O = H2S + OH- (very small amount, but detectable by the nose, I did it many times:-)
Love this stuff! TY for taking the time!
Very nice video. Also, why does the collectors' community not like the restored coins? Is the coin's corrosion a sign of originality and age or what?
This has been a great help for me, in my cleaning of silver plated and solid silver flutes. They have fiddly bits that are hard to reach, and so this method is a great help. I sometimes have a gold plated onto silver area, where tarnishing on the silver below is starting to show through. If I use this method, would it remove the tarnish on the silver below the gold plating, without damaging the gold plating? Thanks
More electrochemistry please
*Watches in 480p anyways*
Thanks for the great videos! I've been a loyal subscriber since 2010. Keep it up!
The foil already has two coin shaped impressions at 1:42! Chemtrails confirmed!!!!
Wow, your video was very well done, and more informative than I could handle! Thank you.
I've a question that lead me here in the first place, perhaps you could help:
I was wondering if something similar would work on a carbon steel knife. Carbon steel oxidizes \ forms a patina when it comes in contact with moisture, and even more so with acidic elements. I've often used baking soda mixed with only a few drops of water as a slurry to rub deeply against the steel and thus remove the patina.
Would iron \ steel enjoy the same process that silver does? Perhaps some metal "lower" than aluminum?
Did this make sense?
Thank you for your help!
Dan
Great video. It would be great to see a video on copper plating coins of different metals, or perhaps nickel plating or aluminum plating such coins.
Well done 👍👍Great video 👍👍Thanks 👍👍
Hey NurdRage! I know nearly nothing about chemistry but I really love watching your videos. I was wondering what gas was being produced by the positive wire going into the solution. Some gas bubbles also formed on the coin itself.
Really neat! Thanks
Does hooking up the positive lead to the silver and negitive to the solution cause the silver to rapidly tarnish?
Yup. It's also known as anodization.
Where would it get the sulfur?
You'd have to add some. One of the older NurdRage videos goes into it: ruclips.net/video/VrA7Jyw1uOs/видео.html
I just tried the aluminum foil way with my silver. It smells like sulfur.
Great presentation!
I just subscribed only after the 1st video. Can't wait to see more like this. Thank you
So the collectors never clean their coins? I don't get it why they would hate this particular method, which if I'm getting it correctly does not remove actual silver, unlike how physical cleaning might.
Perhaps it's because it removes proof of it's age.
Many times silver might be protected with a patina, and this cleaning method will remove that as well.
The only accepted cleaning method I read of is painstaking hand cleaning with soap, spirits, small tool tips and mild abrasive.
Edit: Should only be done respectably by someone who knows what they are doing, oc
Even removing dirt can be destructive.
Brandon Wiker never clean a coin collectors want them original untouched it can kill up to 80% of the value
+lucky43113 whoops, I know, I meant to mention that many things, (not necessarily collector) are restored professionally.
can you provide a source fot that ?
No matter how many times I see that happening, it feels like the first time as a kid seeing the silver clearing in front of your eyes.
Very Nicely Done ! 👍
I want to ask if I can use this method when I will clean copper, bronze or brass, nickel, aluminium coins etc. I mean, I combine the salt, baking soda, water, and aluminium foil rather than using the vinegar salt method because it might have other side effects if the coin is not silver. I'm not using the battery. Only the natural way. Thanks. You are a professor, so I might get a better answer. So, can you explain?
I thought it was oxygen that caused silver to tarnish? Or perhaps it does form and oxide but the tarnish color comes from sulfur?
Works great on old Or tarnished jewelry!
Hey Nurd Rage
What is the cheapest DIY homemade solution for protecting copper traces on a PCB?
Commercial liquid tin solutions are prohibitively expensive for general hobby use, in my opinion. My problem is the shelf life of liquid tin solutions and their limited reuse. What is a possible solution for a casual hobbyist to achieve at home without a fume hood or super hazardous materials handling?
Tin is usually used because the process is done before adding components to the PCB. What if the problem is assessed from a different perspective by looking at our core objectives instead of considering alternative solutions to an established norm. Most hobbyist electronics PCBs are single sided. We are also mainly looking to protect the copper from oxidation. What protective options are possible when the PCB could be treated at any stage of the process, even after the parts have been soldered?
A secondary consideration of note is appearance and visual appeal. We all want something pretty that reflects all of the thought and effort that went into our projects.
The biggest challenge is cost. Let's say I etch 6 PCBs a year, one every 2 months. This will cost me around $20 w/shipping for a 125ml bottle of liquid tin from circuitspecialists. From everything I've read the solution is 'one-and-done' on this time scale. That's too much in my opinion, especially when etching a prototype myself is already far more expensive than ordering one from a Chinese PCB board house. What can I do at home for less than $5 per project?
-Jake
A first guess would be resin or clear nail polish as cheap DIY solutions? o:
Halbostfriese
Yeah paints are an option. That's just less appealing to my 'two digit IQ "ewww!-somethin-S H I N Y"' half of my brain. A good 2 part epoxy coating would probably be best as it would bury and seal any missed contamination and has the most potential for durability if mixed and applied correctly. -At least from my perspective as an ex-auto body painter.
My issue is that paint does nothing to help my subconscious dilutions of becoming the next John Fluke. The utilitarian ugliness of it is such a downer. Every time some racist bozo talks crap about a low budget device from China, and it looks better than my paint job, it hurts. My inner caveman needs a good handcrafted shiny, but my cheap bastard American poor house culture is holding me back.... I need help with my pretentious first world problems ;)
I protect copper traces just with a fair amount of rosin dissolved in ethanol. Then I dry it under a 100W desk halogen lamp. If you don't dry it, the coating may be sticky, but if you dry it that way, it seems to be elastic and not chip off. The bonus is just fanstastic solderability of such boards.
First, a disclaimer: I don't make my own PCBs, I don't tinplate myself. However, what I can do is look up information really, really well. I also have an interest in science like this, so I wanted to see how to go about doing it, to try and help out a fellow science nerd.
Solutions have a limited shelf life because of the chemical composition; it deteriorates once mixed, thus the issue there. Thus my quick suggestion for a professionally made tin solution replacement would be Tinnit Tin Plate ( www.amazon.com/Parts-Express-Tinnit-Tin-Plate/dp/B0002BBV0A ) it ships the dry chemicals in two packages that must be mixed together with water to activate. It's also fairly cheap, though I'd try to combine it with other items so you're not paying twice the price, effectively, just because of shipping and handling. The two packages make almost 500 mL, too (they say it makes 1 pint), so it's rather cheaper than most commercially available liquid tin solutions in much greater quantity as well.
If you want to make your own entirely, however, you can use a combination of Stannous Chloride, Thiourea, and Sulfamic Acid in a 1:4:6 ratio; 0.5g Stannous Chloride, 2g Thiourea, 3g Sulfamic Acid mixed with 100mL of heated, distilled water makes almost as much as the 16 dollar bottle of liquid tin from MG Chemicals. You can get a lot of these materials for fairly cheap, too;
1800g Sulfamic Acid, $17: www.amazon.com/Aqua-Mix-Sulfamic-Acid-Crystals/dp/B000GFJTVA/ref=sr_1_5?ie=UTF8&qid=1507395317&sr=8-5&keywords=sulfamic+acid (image shows 4lb, but it's the 1lb order)
500g Thiourea, $26: www.amazon.com/HiMedia-GRM611-500G-Thiourea-R-500/dp/B00DYOE12M/ref=sr_1_2?ie=UTF8&qid=1507395243&sr=8-2&keywords=thiourea
100g Stannous Chloride, $22: www.amazon.com/Science-Company-NC-7784-Stannous-Chloride/dp/B07621WNNV/ref=sr_1_5?ie=UTF8&qid=1507395220&sr=8-5&keywords=stannous+chloride
With these volumes, you could make 200 batches at the volumes given above (the limiter being the Stannous Chloride), or about 20 litres of product. These are also just quick searches for each chemical to show an example, as well; if you look around I'm sure you can find better deals or better volumes for your specific needs, or if there's a local chemical supplier you can get in touch with, that would work too.
NileRed actually has a video on making Stannous Chloride as well, ruclips.net/video/zziLOly2R8U/видео.html Note that he remarks that isolating solid Stannous Chloride is hard to do, so the effort involved might not be worth it at all.
There are three commercial options for tin plating PCBs.
1)"Tinnit" this is a two-part dry chemical that you dissolve in water, once mixed it has a three month shelf life although I've continued to use it for up to a year and a half(turns yellow and smells terrible).
2) "liquid tin" from MG chemicals, this is a pre-mixed clear solution which keeps for a couple years and can be reused until it stops working. Keep a separate bottle for your used solution and keep your fresh bottle fresh.
3) the "Plug N' Plate" kit from Caswell plating, this is a brush plating kit it's actual electroplating so you'll need to move your ground from net to net as you go, the solution apparently keeps forever and the consumables are available. There's a version of this kit for all the commonly plated metals making the gold fairly tempting, however the gold kit is twice the price of the more lowly metals and the solution has a fairly brief shelf life.
There is however another way for hobbyist to produce good-looking corrosion free PCBs. I'm going to build this up a little because I read this many times when I was learning this skill and I refused to believe it. I was convinced it was amateurish, and tedious, and time-consuming but here and now I am wholeheartedly recommending it. By far the simplest quickest and cheapest way for a hobbyist to produce beautiful, shiny, corrosion free PCBs is to simply solder over the traces while your assembling the board, really. Just leave the resist on until you're ready to assemble.
However I'm also quite interested in Nerdrage's perspective on this problem.
Amazing reaction! I have never expected a electrochemistry happening so fast! I have a question regarding to this reaction though. Are the H2S introduced by yourself, or is it a common contaminant that attacks silver?
very cool demo & explanation.
You can see some blueish green in the water coming off the copper wire as you pull it out - is that copper sulfide?
He did it, nice.
Even being well aware of the "patina"-nazis, I am still very surprised about the information in your warning. If they interpret that removing tarnish in this manner is somehow deceptive, then that just blows my mind. But maybe you just mean that removing the tarnish kills the value. If so, I can understand that. It's ridiculous, but I can understand it. If you have the right chemicals, and do the right process, you can speed an aging effect in such a way that is totally undetectable. Patina is not an attribute that should be used for the sake of price estimates! >_
So why do coin collectors not like this method? It seems to restore the coin to its former glory.
Abaris84 I also want to know this
Maybe the hystorical value if you take away the oxidation,i dunno.it's really a guess :D
Because the tarnish is part of the collection value. It shows what the coin has been through, while maintaining itself all that time. An authentic piece that has been carefully treated so as to not be tarnished is far more valuable than a tarnished piece. It's known as the "old, fine wine approach" to collecting, unlike with, say, paintings, or more mundane goods that benefit from being cleaned and repaired. That doesn't mean you can't remove dirt and other such debris, but not the natural finish or patina that the coin has created for itself. Note that removing PVC damage (have you ever seen a penny that had green junk covering its surface? That's PVC damage) is different.
I mean it's such a weird thing. I mean if the really like that rust I can put it into a highly oxidizing solution so to make it "valuable"
They hate that just as much as cleaning it. You're destroying the natural effects that the coin has been through over time, and THAT is what they value. The coin itself doesn't carry any more value than the material it's made from and any manufacturing defects that can make a coin unique, otherwise.
INCREDIBLE
You should do the glow stick video again
You have not explained the need for alkaline conditions. My guess is that the aluminium electrode has a more complex half reaction, one that possibly involves tetrahydroxoaluminate ions..
Great video. So what happens if you leave it to be electrolysized(?) for a long period of time, or even do it 2 or 3 times? Will it improve the look? Thank you,
That was amazing.
It was taking to long to shine one of my bugles so i tried this though i used a method similar to brush electroplating, Its amazing how fast the reaction was. Instead though i used a 9v battery not a pack
can you please make a video on your lab
So if you stirred around the coin,
And caused bubbles,
Wouldn't it work better?
More oxygen?
amazing video
I really like the idea of redoing old videos since I do enjoy them still but I feel like that should not slow you down from creating new content a lot.
What about bronze coins?
I found a silver half dollar at an ocean beach with a very thick build up of patina, likely from the salt water. Would this method be effective in removing the patina and restoring the silver?
Did you end up finding a way to clean it up?
Wow! I enjoyed this very much!! Thank you for posting.
Fascinating ! Really fascinating !
I really enjoyed this one.
I fricken love your channel! Your chemistry is so cool!
Love the videos! You made me love chemistry!
Take a cup of vinegar and a table spoon of salt and chuck in a handful of tarnished pennies. They clean up almost immediately. Without using aluminum or electricity.
haynerbass technically a different approach,Dissolving the oxide vs reducing through electrolysis.I would say the electrolysis is much faster
I fucking love this video ! It is so good ! These chemistry phenomenons are mind-blowing OuQ
This is amazing, will any of the tarnishing and untarnishing damage the silver?
It will permanently alter the features of the coin (albeit very slightly) depending on the amount of tarnishing. That's why he put the warning at the beginning of the video. You'd only do this if you solely care about the metal content.
We have been using this to clean silver ever since in our household, but we only used salt, no baking soda and it worked fine too, does the baking soda really make such a big difference?
STILL HELPFUL IN 2021
That's some good chem right there.
I kind of understand why the silver would be reduced at the + end, but how does it make sense that you would be forming hydrogen gas at the + end as well?
Loved it. Thank you.
Try making polyaniline by electrochemical method.
3:31 Mind is blown ! Yeah that does make it much more interesting :'D
What would happen if you'd keep the silver coin in after there is no silver sulfide left on the coin?
Interesting video..Thank you for sharing💖
This is great. Well done!
it was really usefull,thanks a lot.but i have a question. is this possible to connect the negative end of the battery to the aluminium foil?
It's not Electrochemistry, it's Electrickery... :P
Nooo, electrickery is the thing that makes the electrochemisty possible.
*_HERE'S A LITTLE LESSON IN ELECTRICKERY_*
twocvbloke 21
TheMrAntoMean *
He's a witch!!! lolll
Might be fun to place the coin in a tarnishing and electrolyte solution and then you could go back and forth by removing the wire
wow, just awesome, thanks a lot.
amazing video ...thanks