@@ironcrapprgaming It's the lead that gives ya the twitches, not the bluing. 🥴 I know cuz of all the window sills I ate as a kid. Neighbors wouldn't let me over to play after a couple months cuz I ate half of their window sills. Anyway, I'm gonna go back to vacuuming my front lawn and oiling my brake pads.
This was sooooo helpful! I want to make a metal top for a sideboard/coffee station and couldn't find any good videos except yours. It won't encounter much food but I wanted to be safe and still have that patina look to it. I really appreciate that you broke down the math/science and also showed how easy it is to do.
Huh, not many people make "for the future" type how-to videos like this, on the off chance someone is wondering this, 2, 5, or 20 years from now. Good on you, and thanks for the video!
If you eat potatoes in any form your eating selenium :) Also you can blue steel with potatoes I had a blued knife and while the coating is self healing stabbing a potato with it would repair the bluing a little faster. Take a high carbon steel knife and stab it in a potato and leave it for say 24 or 48 hours and check out the effect. Use a coarse scotch bright to clean off any oils with some isopropal and to give the selenium a place to react. Use steel wool to polish the coating and repeate a couple times for best effect youll get a nice dark even color you will need to resharpen after as it will cause some minor corrosion along the edge you will need to address
Tomorow i will restore a cast iron steak plate, i was wondering how could i redo the black finish after remove all the corrosion with the stell brush. This one was a really useful video.
Bluing is pretty dang dangerous, and if you ask me, I wouldn't risk it. Cold blue chemicals are hella dangerous and even getting a little on your skin will start to blue it. It'll wash off, but prolonged isn't safe at all. I've worked with my fair share of rifles in need of bluing, so y'all stay safe.
I suppose that for the daredevils at home: It should be pointed out that the oil should be a food-grade one, like olive oil or some other vegetable oil.
Does the steel turn blue because the selenium dioxide layer is coloured blue or does it colour the steel through thin-film interference, like when tempering metals ? I didn't really understand the Wikipedia page on Bluing (steel). Update: Question answered by actually watching the entire video. Note to self - watch the entirety before asking questions.
Hot bluing is done using sodium hydroxide and some sort of nitrate or nitride at about 300°F. It leaves magnetite on the surface. The cold blue is producing copper selenide, and that is toxic. It isn't water soluble, but it is toxic. Generally speaking selenium is toxic in sub-milligram quantities, and it bioaccumulates.
Once i cold blue a iron pan as foundation then seasoned couple of times and gave astonishing results, but not being sure if it was safe or not i put that away…
Dude! That was great! My question was should I cold blue the inside of my carbon steel frying pan? Is there an advantage over just seasoning it on the grill? I think you answered that but maybe in a yes or no would help me some.
Mike I think the blueing would not help with food burning to it, so it would end up seasoned with regular use anyways. Grapseed oil may be your best bet to pre treat it
The only way I could see it being a legit concern of even transferring from the blade to food, is if it had an existing scratch before using it possibly causing the coating to be more prone to come off in use. That or if you're cutting on a hard surface like a stone counter or if the blade got scratched while cutting through a bone.
The hydrogen peroxide method would work very well for the people that sand lodge cast iron and have problems with seasoning not sticking. Also turns the polymerized oil black
Great video. I've been thinking about making a knife myself and recently I got the idea of bluing the blade. I was not sure if it was food safe though(as I honestly had no idea how the actual process affects the steel). Let's see if I ever actually get around to doing it though lol
I take selenium supplements as prescribed by my Endocrinologist for my thyroid issues. It works for my specific situation too. I think what makes the cold-bluing stuff so dang dangerous is the catalytic acids suspending the selenium. That said, I'd probably not use the stuff on my cutlery either way. May be all too superstitious about acid safety.
🤨 My math teacher: "Pay attention! This is important." Me: "Pfft! When am I ever going to use this?" *heavy sigh... Mrs. Roller was right??!!! Well... f-me!
I tried a Mosin and stripped and de-greased it throughly and it still came out like garbage, I think the steel in the Mosin's isn't the greatest. My grandfather had an old Sears Roebuck break action 12 gauge that I did at the same time and it came out looking perfect when I used the same gun blue on it and stripped it and de-greased it in the same way. I ended up just using black high temp/engine block enamel paint on the Mosin to make it look nice.
I was not able to find any info on the hardness of Selenium dioxide but Magnetite Fe3O4 is 5.5-6.5 on the mohs scale (just as hard as the knife steel itself) I'd prefer using cold blue if it was even a bit harder than Magnetite If anyone is able to find any info on the hardness of Selenium dioxide please link me to it ^^
Evren Uçar I don’t know about the hardness but I think the corrosion protection comes mostly from the porous coating being saturated with oil. I would put my money on the cold blue being better than the black oxide for abrasion resistance because it is a lot easier to make a solid consistent coat.
I've been using cold blued kitchen knives for years and haven't keeled over yet. I used to vinegar blue them until one day when I didn't have any vinegar on hand and used Oxphoblue instead. It wasn't until I jad beed using the knife for about a monthe that I saw a video with some guy screaming about not chemically bluing anytjing that is used fir food prep. I determined then that this was an over reaction and a false belief.
I’ve been trying to research sur fin black 40 and 70 chemicals to see if it is harmful. Maybe you’d like to help out? It gives an instant nice black color, but I can’t find any information about it. Let me know if you’re up for the task?
Dear Mr.Jairus, can I know how you connect the servo motors to a switch in the Iron Man Rocket Launcher project? I have everything planned out but I just don't know how you can glue shut the controller board and make the servo turn with just a button......I've watched all the 10 videos a few times and I still don't get it
Neil Sandwich I was planning to do it to the knifes that I etched in the last video. But I didn’t want to encourage anyone to do something dangerous so I made sure it would be ok. Didn’t work though because of goo gone. Lol
you say that only 2cmspuare is poison effect and ten you say its safe...... DOn'T!!! You cannot dig 2cmspuare from the steel surface but you can't know what happens? For example a grinder or a shapener can dig more than 2 cmspuare. And if 2 cmspuare is toxic, the knife can loose more than it and, less than 2 cmspuare of it even it doesn't poisons it effects worse??? the topic must be searchd AGAİN!!!
Do you have any data as the toxicity of selenium dioxide through skin contact? I have a steel ring I want to cold blue. Will the constant skin contact pose any harm?
Jacob Danhauer just air tool oil. It’s what I had in the garage. But I think you can just use cooking oils if it is a kitchen knife. That’s what I use on mine and they haven’t gotten any rust.
Cold blue (at least the Oxpho Blue I use) doesn't oxidize steel. It's a patch, made of a copper oxide. It doesn't transform the outer layer of the steel, like hot blue does, it just coats it. Or selenium oxide like you have there.
sucks: putting cold blue on your kitchen knife to protect it from rust, but worrying that it might be poisonous fucks: putting cold blue on your fighting knife to protect it from rust, with the added benefit of slight toxicity
Watch the video again, he uses the correct units. When referring to the 2.5microgram coating he uses square cm, which is accurate. If he said 2.5micrograms/cubic cm he would be describing a 4d shape... and he doesnt have a blued tesseract. Mmmm geometry.
Of course It's safe. I've been licking my guns for years and i'm perfectly normal.
:twitch* "me to!" :twitch*
Same same same
@@ironcrapprgaming It's the lead that gives ya the twitches, not the bluing. 🥴 I know cuz of all the window sills I ate as a kid. Neighbors wouldn't let me over to play after a couple months cuz I ate half of their window sills. Anyway, I'm gonna go back to vacuuming my front lawn and oiling my brake pads.
To be safe just eat the cutlery in its entirety
Nice! 😂
oh my goodness it is the legend himself!!!
I thought you "retired"?
I felt myself entering a comfortable warm fog halfway through the math. But I came out the other side unharmed. 👍🏻
BrainfooTV 😂😂😂
I was waiting for you to lick the metal like “THERE ITS SAFE” 😂
Kamerick 😂😂 I should have!
JAIRUS OF ALL haha 😆
This was sooooo helpful! I want to make a metal top for a sideboard/coffee station and couldn't find any good videos except yours. It won't encounter much food but I wanted to be safe and still have that patina look to it. I really appreciate that you broke down the math/science and also showed how easy it is to do.
Huh, not many people make "for the future" type how-to videos like this, on the off chance someone is wondering this, 2, 5, or 20 years from now. Good on you, and thanks for the video!
If you eat potatoes in any form your eating selenium :) Also you can blue steel with potatoes I had a blued knife and while the coating is self healing stabbing a potato with it would repair the bluing a little faster. Take a high carbon steel knife and stab it in a potato and leave it for say 24 or 48 hours and check out the effect. Use a coarse scotch bright to clean off any oils with some isopropal and to give the selenium a place to react. Use steel wool to polish the coating and repeate a couple times for best effect youll get a nice dark even color you will need to resharpen after as it will cause some minor corrosion along the edge you will need to address
Simple little video or not, I actually really liked that one. Good job!
Tomorow i will restore a cast iron steak plate, i was wondering how could i redo the black finish after remove all the corrosion with the stell brush. This one was a really useful video.
The edits in this are fantastic!
Bluing is pretty dang dangerous, and if you ask me, I wouldn't risk it. Cold blue chemicals are hella dangerous and even getting a little on your skin will start to blue it. It'll wash off, but prolonged isn't safe at all. I've worked with my fair share of rifles in need of bluing, so y'all stay safe.
Oddly good timing, I just finished blueing a gun barrel for the first time...
I suppose that for the daredevils at home: It should be pointed out that the oil should be a food-grade one, like olive oil or some other vegetable oil.
Dont use olive oil or veg oil. They can go rancid. Use mineral food frade oil
@@user-pm7pw1tl3t or coconut oil 🥥
Is this similar to "patina" on carbon steel such as knives? I know patina creates a natural layer and helps prevents rusting
Gsxr-1000 Rider I’m pretty sure it is. There are lots of different things they do on an industrial level though.
I would trust hot bluing over nitric acid bluing for food use steel, nice job on this
One of the very best channels on the yewtewbs
Does the steel turn blue because the selenium dioxide layer is coloured blue or does it colour the steel through thin-film interference, like when tempering metals ?
I didn't really understand the Wikipedia page on Bluing (steel).
Update: Question answered by actually watching the entire video. Note to self - watch the entirety before asking questions.
Hot bluing is done using sodium hydroxide and some sort of nitrate or nitride at about 300°F. It leaves magnetite on the surface.
The cold blue is producing copper selenide, and that is toxic. It isn't water soluble, but it is toxic.
Generally speaking selenium is toxic in sub-milligram quantities, and it bioaccumulates.
You put too much effort into everything xD I love it!
Really enjoying these tutorials!
Awesome vid. Great info and a brilliant explanation. Thank you for doing the work for us and making easily understood.
This was awesome I've never seen blueing done before
Not too shabby! Mainly watched the whole way through just for your face tho cuz it’s cute😂
you could season it too! you put cooking oil on it and put it in the oven at 400F for 45min and repeat to your liking.
Once i cold blue a iron pan as foundation then seasoned couple of times and gave astonishing results, but not being sure if it was safe or not i put that away…
Dude! That was great! My question was should I cold blue the inside of my carbon steel frying pan? Is there an advantage over just seasoning it on the grill? I think you answered that but maybe in a yes or no would help me some.
Mike I think the blueing would not help with food burning to it, so it would end up seasoned with regular use anyways. Grapseed oil may be your best bet to pre treat it
Nice Winnebago Man impression at 11:10.
Well done! Thanks for sharing useful information in an intelligent manner.
I thoght I was haveing a stroke at 6:39
The only way I could see it being a legit concern of even transferring from the blade to food, is if it had an existing scratch before using it possibly causing the coating to be more prone to come off in use. That or if you're cutting on a hard surface like a stone counter or if the blade got scratched while cutting through a bone.
super informative! which kind of oil would you suggest is best to apply after the blacking process?
Mineral oil food save grade. Dont use cooking oils as they go rancid
i like that you do the math
The hydrogen peroxide method would work very well for the people that sand lodge cast iron and have problems with seasoning not sticking. Also turns the polymerized oil black
Dude much appreciated for all the research on this topic, I am now ready to risk the life of myself and my friends on making a minecraft furnace
I wonder how these test fair up to dipping steel into hot vinegar
It's rare in these times to find a video this old where no one misclicked on the dislike button. Now to make my own black scary rifle.
Great video. I've been thinking about making a knife myself and recently I got the idea of bluing the blade. I was not sure if it was food safe though(as I honestly had no idea how the actual process affects the steel). Let's see if I ever actually get around to doing it though lol
I take selenium supplements as prescribed by my Endocrinologist for my thyroid issues. It works for my specific situation too. I think what makes the cold-bluing stuff so dang dangerous is the catalytic acids suspending the selenium. That said, I'd probably not use the stuff on my cutlery either way. May be all too superstitious about acid safety.
You can also do this by putting Steele in the microwave
🤨
My math teacher: "Pay attention! This is important."
Me: "Pfft! When am I ever going to use this?"
*heavy sigh... Mrs. Roller was right??!!! Well... f-me!
Just finished re-blueing a moisn, and for whatever reason, it took forever with the brichwood casey! And I missed a spot, so I have to fix that..
Did you remember to degrease?
I tried a Mosin and stripped and de-greased it throughly and it still came out like garbage, I think the steel in the Mosin's isn't the greatest. My grandfather had an old Sears Roebuck break action 12 gauge that I did at the same time and it came out looking perfect when I used the same gun blue on it and stripped it and de-greased it in the same way. I ended up just using black high temp/engine block enamel paint on the Mosin to make it look nice.
jairus is trying to turn us all blue!
What about either one of these applied to a brass pipe (one hitter) for smoking? Brass is nice as is but some love everything black.
Your thoughts?
I was not able to find any info on the hardness of Selenium dioxide but Magnetite Fe3O4 is 5.5-6.5 on the mohs scale (just as hard as the knife steel itself)
I'd prefer using cold blue if it was even a bit harder than Magnetite If anyone is able to find any info on the hardness of Selenium dioxide please link me to it ^^
Evren Uçar I don’t know about the hardness but I think the corrosion protection comes mostly from the porous coating being saturated with oil. I would put my money on the cold blue being better than the black oxide for abrasion resistance because it is a lot easier to make a solid consistent coat.
I've been using cold blued kitchen knives for years and haven't keeled over yet. I used to vinegar blue them until one day when I didn't have any vinegar on hand and used Oxphoblue instead. It wasn't until I jad beed using the knife for about a monthe that I saw a video with some guy screaming about not chemically bluing anytjing that is used fir food prep. I determined then that this was an over reaction and a false belief.
If you sharpen the knife, will you have to reapply the coating?
yes, though if the knife is being sharpened semi regularly it shouldn't rust
Bravo, good video. Thanks for info. I have looking for some explenations about metal blueing if is food safe and i have found it.
Is the metal still conductive after you apply the blue or blacken it?
Jared Wiegers That’s a good question! I’m not sure if that coating is conductive.
I’m liking the more informative videos
I’ve been trying to research sur fin black 40 and 70 chemicals to see if it is harmful. Maybe you’d like to help out? It gives an instant nice black color, but I can’t find any information about it. Let me know if you’re up for the task?
Great vid, brought me back to chemistry class haha
Dear Mr.Jairus, can I know how you connect the servo motors to a switch in the Iron Man Rocket Launcher project? I have everything planned out but I just don't know how you can glue shut the controller board and make the servo turn with just a button......I've watched all the 10 videos a few times and I still don't get it
Loved the video, love all your videos. I'd love to see you make your Viking weapons blue.
Awesome video man, super informative thanks, subscribed!
What are you planning with this blueing
Neil Sandwich I was planning to do it to the knifes that I etched in the last video. But I didn’t want to encourage anyone to do something dangerous so I made sure it would be ok. Didn’t work though because of goo gone. Lol
Hmm, what about using ferric chloride to make knives black? Does that add protection
Mr. Frogman99 I have no idea. I thought it was just for bringing out layers in damascus. Good question!
JAIRUS OF ALL it also can acid etch the entire blade a dark grey/black, I think it's often used for making stonewashed finishes
Mr. Frogman99 I did not know that! I’m gonna have to look into it more now.
Would this still be food safe if this process was used on steel that is heated up? For stove top grill trays if you were wondering why.
I have a stove top griddle that's 7 guage carbon steel. Seasoning, like with cast iron, is really the way to go.
what about ferric chloride? i build knifes and have made good experiences with a ferric chloride etch.
you say that only 2cmspuare is poison effect and ten you say its safe...... DOn'T!!!
You cannot dig 2cmspuare from the steel surface but you can't know what happens? For example a grinder or a shapener can dig more than 2 cmspuare. And if 2 cmspuare is toxic, the knife can loose more than it and, less than 2 cmspuare of it even it doesn't poisons it effects worse???
the topic must be searchd AGAİN!!!
Hey first for once! Notification squad sound off!
Do you have any data as the toxicity of selenium dioxide through skin contact? I have a steel ring I want to cold blue. Will the constant skin contact pose any harm?
I don't see a reason why the minimum toxicity would change
Wait, what time is it?
sooo i was thinking to use cold blue on a steel ring. If it's food safe, it is skin safe right?
meh yeah I wouldn’t be worried about it but it might make your skin change colors 🤔
@@jairusofall thanks jairus, i will try to see if it colors the skin then :D
But what about skillets
I have a question can this be done using a stencil so that etched lettering dark again ?
provided the stencil was waterproof and wasn't affected by the blueing solution i imagine you could
So how do you blue brass?
Insert good channel name Here no idea! Lol
What type of oil did you apply?
Jacob Danhauer just air tool oil. It’s what I had in the garage. But I think you can just use cooking oils if it is a kitchen knife. That’s what I use on mine and they haven’t gotten any rust.
Now do a video on blueing stainless
Haven't a clue why there aren't as many people liking this.
Thank you!!! Very informative
thank man
that was very informative
So that's how the black knight's armor was made?
Does it work on aluminium
Caleb Maittlen as far as I know these will not but there are ways to do similar things I believe.
Can't wait for Aquaman wetsuit!
where is your EYE PROTECTION?
Oh yes, I think those black oxide pan are much safer than the cheap teflon ones, seriously, becoz teflon made from toxic materials.
Is it weird I enjoyed the math portion? I think I've had enough RUclips for one day haha. 💯💀🔥
Great video
Great vid. But If you wouldn't want these compounds on your skin, I def don't want them in or around my food
the cold bluing solution itself is what you don't want on your skin not what it produces when coming into contact with ferrous metals
@@SkeleCCXL understandable, have a nice day
How is aquaman going?
Matias ambiado terrible! LOL but it’s coming along. I just don’t have enough content to make a video on parts of it.
Really enjoyed this video, I’ll love to see more of these informative videos with your own opinion added
I love the vids and I think I'm going to do this with my katana
Love it.
Whaddup my guy
Not much. Getting ready to fix the powerfist. One of the solenoids failed.
If you are eating a gun i'd guess your immediate threat is sudden Lead poisoning🤣
Sorry, couldn't resist!
great video
Cold blue (at least the Oxpho Blue I use) doesn't oxidize steel. It's a patch, made of a copper oxide. It doesn't transform the outer layer of the steel, like hot blue does, it just coats it.
Or selenium oxide like you have there.
4:06 he said the M-Word
Or just use mustard
sucks: putting cold blue on your kitchen knife to protect it from rust, but worrying that it might be poisonous
fucks: putting cold blue on your fighting knife to protect it from rust, with the added benefit of slight toxicity
The M word! 😂
Also, super informative! Love it!
Thanks man!
Do you like Pringles?
Yes Sir I do.
So... you have to coat the metal with OIL, for it to work?
LOL.. Does anyone else see a problem with the logic of that statement?
Ur great bro
Pshhhhh.....suhhhhhh dude 🤙
🤔
You kept saying "square centimeters" instead of "cubic centimeters"
Watch the video again, he uses the correct units. When referring to the 2.5microgram coating he uses square cm, which is accurate. If he said 2.5micrograms/cubic cm he would be describing a 4d shape... and he doesnt have a blued tesseract. Mmmm geometry.
@@ljk8059 good call, I wasn't thinking of it correctly when I first saw it.
@@steelbluesleepR ain't no thing :-) i really want him to build a tesseract now... no idea how, but Jarius can figure it out jf anyone can ;-)
《 LJK 》 oooh! Cool idea!
@@jairusofall doooo iiiiit!
Cool
Awesome second time being hearted
A really good way to shut people up who want to contradict you would be to dye all your own cutlery
nice
I'd love to see you do the math using american measurements, Oz, Lb, inches etc
Ravioli ravioli
dont lewd the dragon loli.