The Gelatin Silver Process - Photographic Processes Series - Chapter 10 of 12
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- Опубликовано: 11 дек 2014
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The gelatin silver process was introduced at the end of the nineteenth century and dominated black-and-white photography in the twentieth century. The paper or film used to make gelatin silver prints and negatives is coated with an emulsion that contains gelatin and silver salts. Gelatin silver prints and negatives are developed out rather than printed out, which means that exposure to light registers a latent image that becomes visible only when developed in a chemical bath. This process requires shorter printing times than earlier printed-out processes such as salted paper prints and albumen prints. George Eastman’s introduction of flexible roll film and the Brownie camera revolutionized photographic practice and industry, putting photography into the hands of the masses for the first time. This process is responsible for all the black and white, color and motion pictures produced in the 20th century with analog materials.
This project is made possible by a grant from the U.S. Institute of Museum and Library Services, grant number MA-10-13-0194. 
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Damn. I wish I had this video for my students back when I thought in public schools! lol
you were a teacher man come on, you gotta spell better lol
I never new Kodak was so old, these video series are amazing!
Spent a good part of the 70s working for a company that made photographic gelatin. The impurities naturally occurring in the gelatin would have a direct effect on how the silver responded. So each day we would make the photographic emulsion with the various gelatin batches produced ( or gelatin blends ). The emulsion would be coated on to a film backing ( in the early days we used glass which was later cut in to strips in total darkness ). Once dry it was exposed using a graduated filter, developed and then the density of the greys measured and compared with a standard.
There were dozens of different methods for controlling grain size and distribution. It helped make the work very interesting.
Very interesting!
In my own silver bromide emulsion making, I've used in first experiments a food gelatin that may contains, traces of sulfur compounds, that may increase sensitivity specks during physical ripening, then after successful experiments, I've used special photographic gelatin, from Agfa products, undoubtedly it was extremely purified, and getting a wonderful response, the images that were printed on my homemade photographic paper, since long ago still keeping its, quality tonal gradations, and the white area is still clear. Thanks for your awesome video that's reminding me of the real practical photography.
@Paul Butler I presume to intend to use the emulsion as a mask to protect the glass from sandblasting. In that case, I can't think of any process that would produce an emulsion hard enough to resist.
There may be chemical processes that will etch the exposed glass without affecting the emulsion.
I've looked up some links on etching glass which includes links to sandblasting. Hope this helps
www.etchedcrystals.com/knowledge/sandblasting.html
a true old though still process well tutorialed, the verbal is clear in a language I understand easily. This is six years since put out not too late the dates are within my experience as just like you an earthling, ❤
A gem of a video about a tough to find information on it topic. Thanks!!
This is so interesting, I'm glad I came across your channel. I look forward to learn more.
Awesome 🥳
I think there is still place for chemical photography. I think there are reason not only because quality, but also about limits. Happens the same with vinyl music, it's not only the quality and the "roundness" of the analog audio, it's also the work involved in create that music, and what happened with the loudness war, it happend with photography, but when you need that amount of work to make art in this analog formats, then you take care of doing something better normally called art.
Fantastic! thank you
Anyone else watch these videos while developing film?
Great time filler between agitation intervals.
Great video!
good series!
Many Thanks for your, precious video, which turns back to the early photographic inventions since two centuries ago, which became a huge industry, that was shared in the all universe created civilization, especially medicine, scientific research, cinematic world, space exploration and the whole our contemporary world, The first one was, George Eastman, who established the baseline that continued more than 120 years ago, I'm so glad to seeing, such a wonderful video of how to make and prepare and coating of the fluid silver bromide emulsion, that was my hobby since I was in twenties, I've made an orthochromatic plates, using Erythrosin dye as a sensitiser to silver bromide emulsion, these processes tooks, much effort, time and money, and gets highly successful experiment, in addition of making photographic papers, bromide and Chlorobromide emulations. So I'm very anxious to that interesting point, once again Thanks so much for your, awesome practical explanation, have you more continuation of success.
NICE AND GOOD EXPLANATION !
Amazing video !!
I'm attempting to do this at home. I got interested in analog photography , and I am also interested in chemistry. So I made my own camera with cardstock, duct tape, a toilet paper tube, and a magnifying glass. I am now experimenting with film. I have made photosensitive silver compounds but I can't find a good way to make an intelligible image with it. Tomorrow, I'll try the gelatin process if I can find some glass :p
I made a camera that uses wet paper coated in pepper. I soak the paper in water and all while still wet I pour pepper equally around the paper. I load the wet paper into a pinhole camera and as quickly as possible, set the camera and open the shutter. Leave it open for at least 7 hours without moving it. It’s useless at night because it’s so dark that it will be daytime by the time it starts exposing. The trick is that the brighter spots are better exposed to light (obviously) and because light is converted to heat once it comes in contact with a solid surface, causing the brighter spots to dry faster than the darker spots. The parts that dry first start losing grip on the pepper first, causing it to fall faster than the darker spots. Then when I’m done, I unload it carefully and lay it flat so the pepper won’t keep falling. The result is the pepper resembling a positive image of what I just took a picture of. I’ve used it a lot but 2 of them failed so I stopped. I simply called it the pepper photographic process. I’m surprised nobody tried that before because I couldn’t find any trace of it anywhere on the internet.
film isn't disappearing, it is evolving. Nowadays there is no need for many different kinds of films, because now there are films that are mostly suitable for every photographic purpose. Also there are lots of film-related kickstarter projects out there. I choose digital over film when I am doing my commercial shoots (because it makes it easier), but I still shoot film when i am working on my personal exhibition projects. 120mm film still holds up pretty well.
Love film also, but is getting harder to find and harder to get processed.
That too is about to change. Film and film cameras have started selling off the shelves here as people are ditching their digital cameras. Kodak has just now brought back the T-Max P3200 films. They brought back Ektachrome a few months ago.
I use 35mm, double 8mm, and 620 films. I don’t know why, but something about shooting film is more intriguing to me than digital. The only downside is it’s expensive.
great documentary
wonderful video
Great!
So thats how they make a Photograpic Emulsion.
And it's very intresting that they used to make a photograph on a glass. :)
Did they use this process in the movie 'Love Jones'?
great
So my big question is, why silver? Out of all the elements that are similar to silver why silver? Of course the halides are needed for the electron swap but there are plenty other elements like silver that have a 1+ charge. Is it because it’s the easiest accessible element that has crystalline structures with those “defects” and also a 1+ charge?
Would you happen to know if there is a way of developing films without the use of gelatin ? Thank you 😊
Hello.
I am a subscriber in South Korea.
I want to do gelatin dry plate photography. What kind of developer, stop bath, and fixer do you use?
I would like to start production with 16/35/70mm but have no way to find any for sale..I would like to know where I would go to find the resources to start making my own film myself ?
Any idea how to make a silver Nitrate film?
Hello.
I am a Korean subscriber.
I heard that the melting point of gelatin in silver gelatin emulsion is about 25 degrees.
In Korean summer, the temperature rises to 35 degrees Celsius. Wouldn't the silver gelatin emulsion film melt like this?
Is there a solution to this?
If I want to experiment with making my own emulsion plates, where can I purchase the clean glass plates?
Please contact workshops@eastman.org! They can help with your question.
If these guys saw digital photography…wonder what they would think. 😮 There’s something better tho about a camera ❤
In a way it's kinda sad film is disappearing but digital is really better, alot of people complain that it lacks creativity but I don't think that's true. If you look at Gursky's work for one it's very subtle changes that make his photographs stand out
I don't believe creativity is the reason why one would be better because creativity happens in the mind. To me, digital doesn't have the same hands-on feeling as when I use film and then develop and print it myself.
Digital really is not better.
@@profd65 Yes it is. Analog just has some advantages mostly on the archival aspect of it but other than that is more an art than something truly useful today. Can you imagine the internet if digital photography didn't existed? it would be worse than the internet of the 80's, this video wouldn't be possible! Its the crude reality, but even as that I enjoy a lot indulging on this analog techniques as a hobby.
WTF! “Obsolete” and “historic process”?!
Are these the same people who is trying to keep film alive and relaunching new emulsions?!
Film is not obsolete.
It’s superior.
Vastly superior.
And shouldn’t Kodak be telling us that?
Instead they are doing halfarsed history lessons, that has been done much better before.
And historic process?
WTF does that even mean?
Everything has a history. But film has its best time ahead if Kodak wants it to.
E. Augusto I don’t know if you’re aware but film is experiencing a revival right now.
The sheep who’d be too cheap and uninterested to finish a roll in a year have been sifted away. Good for focus but bad for the economy and infrastructure of film.
Pros and enthusiasts, on the other hand are giving film a major comeback.
Digital cameras are on a downwards spiral.
The market has either stagnated or is declining.
Digital photography mainly has it’s dominance in phones where it is used to take the billions of inane forgettable fotos you see on Instagram.
E. Augusto E. Augusto also you do a hell of a lot with attitude and the right marketing.
This is not a start.
This is defeatist and making yourself appear a museum piece.
Nothing wrong with museums but I don’t think the rest of the company has that in mind.
There is no such thing as analogue photography!!! The rest of your films are so accurate and professional but this?! Do educate yourselves!
There is no audio in this except for the piano?