sorry for kidnaping the thread but this reminded me of an old idea. Does anyone have a list of things that can be used as photochemicals but is commonly found in the kitchen or a local grocery store
|I try to get started:
coffe-as developer
citric acid-as a stop bath
baking soda-asan accelerator
salt- for HCAAND A MILD FIXER
what else and for what
ideallyI like to end up with all processing chemicals right out of the kitchen.Is that possible?
:confused:
Sodium thiosulphate (hypo) is sold as a food additive for cattle, so can be found in farmers' co-ops etc, much cheaper than as photochemical. Like sodium sulphite, it is used in a multitude of industrial and agricultural applications, such as leather tanning. So it is generally speaking very easy to obtain. Ammonium thiosulphate is somewhat harder to obtain, and more expensive.
Sodium carbonate (washing soda) is sold in grocery stores.
Vitamin C or sodium ascorbate is of course used in caffenol and related developers, and is sold in health food shops.
Tartaric acid is used in some alternative processes, such as Van Dyke Brown.
Sodium hydroxide is used in for instance Rodinal, and is sold as drain cleaner.
Potassium metabisulphite is used in many formulas, including reducers and hypo-clear, and is sold as an additive in wine and also in preparation of dried fruit, so can be commonly found in farmers' co-ops.
Paracetamol (aka acetaminophen) is the precursor to the active component in Parodinal, and is sold as pain killer (Tylenol).
Potassium permanganate (used in some bleach formulas) is sold as disinfectant in grocery stores and pharmacies.
Copper sulphate (blue vitriol; used in some bleach formulas) is also sold in pharmacies and grocery stores, mainly as fungicide.
I think most will be surprised how many of the other photochemicals are also used as precursors or reagents in the manufacture of industrial organic compounds such as pharmaceuticals. Phenidone is one such example, as are the pyro compounds such as cathecol and pyrogallol. Many photochemicals are used for the same general purpose in industrial application as they are used in photography, i.e. as pH buffering (carbonates and borates) or chelating agents (EDTA) etc. For that reason they are not particularly hard to obtain via general chemical suppliers. An interesting chemical sometimes used in hair products, is amidol. It is however quite toxic and very expensive, and unfortunately short-lived. I have not yet purchased it via that avenue, as the shipping quantities are typically 25 kg. That will make an awful lot of paper developer. What makes such chemicals expensive is not the starting reagents or process per se, but the administrative overheads of dealing with and distributing hazardous chemicals, and providing proper safety measures etc, especially when international borders are crossed. I am sure you'd be able to buy it for $5/kg directly from the plant that produces it.
The idea of developers such as caffenol or parodinal made from ingredients entirely available from grocery or hardware stores is rather charming. What is more, demonstrating how film can be developed with such lowly and commonly available materials really opens up some people (especially children) to the wonders of 'chemical photography'.