How does a chemical reaction produce photographic images??

Question

I am supposed to be doing an assignment on this subject. It is due on THIS Friday!! Please help me because I have absolutely no idea what it is talking about. Thank you in advance!!

Ciao!! MWAH....

Answer 1

Well, color IDK, but B&W via the old school method is based on the reduction of silver salts to silver metal.  It's an old lab trick to put silver nitrate where someone will get it on thier hands.  After a day or so the exposure to light stains their hands black, for week or so.  But no, I'd never   er put it on a toilet seat!

Answer 2

The undetailed version is this: some chemicals change colors when they come in contact with certain wavelengths of light, aka colors. Beyond that, wikipedia probably has the entire process of developing film.

Answer 3

You're looking for photochemical reactions, where light exposure causes a reaction to occur.  To make an image, you want reaction products that are darker or lighter than the reactants.  The classic is the photochemical reduction of silver halide salts to silver.  Subsequent 'developing' amplifies the contrast. 'Fixing' removes one of the reagents to prevent any further change.

See Wikipedia: Gelatin-silver process