Which chemicals

[ducey99]

When you develop a picture from a pinhole camera which are the 3 chemicals that you need?

[Clanad]

You don't say whether you mean the film from the camera or the picture from the film from the camera. Let's assume you mean the black and white picture... first would be the developer, which is diluted with water and is mostly a very complex chemical (e.g hydroquinone=1,4-dihydroxybenzene;). Next would be the neutralizer to stop the development process... all developers are alkali, so an acid is used to stop the development (hence stop bath) Mostly an organic acid as citric acid (2-Hydroxy-1,2,3,-propanetncarboxylic acid)is used in dilution to do the job. Finally, would be the fixer, a bath. This bath reacts with the remaining (not developed) silverhalide in the emulsion of the print, in order to remove that silverhalide. The final result is that only the metallic silver remains in the picture. The chemical compount to do this is called a fixer, nowadays mostly ammonium thiosulfate... (Thanks to: Photo Net).
All of these chemicals are purchased in concentrated form and must be diluted with water... mainly depending on the type of photographic paper being used...