I gave Son2 some of my old film cameras just to tinker with and for their possible antique value.
He suddenly got interested in them when Son1 sent us an article (see REF) on developing film using coffee as a developer and he tried it with some B&W film he got somehow.
He found it actually worked, and I explained that any mild reducing agent could be used as a developer, "stealing" the halides* from the light-sensitized silver halide molecules and leaving the opaque metallic silver grains where the light had struck. (The article also mentions using vitamin C, as well.)
First attempts on the coffee developing were not very good, but at least a negative image formed. Later attempts were more successful. Then he switched to using commercial developers which he got from somewhere. He actually also bought a developing tank. He was amazed when I told him about the tray-developing process for film --holding the film at both ends and dipping it back and forth in the tray of developer. (Oh, and agitating sheet film ("cut film") in the developing tray.)
What was gratifying to me was I could offer my (rather extensive) obsolete knowledge to him about the whole process from exposure to printing. He was surprised when I told him that printing paper came in different contrast levels to make up for variations in negative quality.
I'm sure the next thing he's going to get is an enlarger. Right now, he's "printing" the negatives by taking digital photos of them and reversing them in photoshop or MSPaint or whatever.
He's even found a source of color film, but he's having that processed by Walgreen's. I was surprised to find out that
anybody is doing color processing.
Some of his color pics are rather outstanding.
So the film techniques have not died out completely, which I was very surprised to learn.
I feel less obsolete now.
Terry, 230RN
* Halides: chlorine, iodine and bromine in the form of silver chloride, silver iodide, and silver bromide are the commonly used silver "halides" used in photography. Google "halogen."
REF (The original coffee-developing article sent to us by Son1):
http://content.photojojo.com/tutorials/coffee-caffenol-film-developing/