[umair baloch]

Why sodiumthiosulphate is used in Photography to:

a) Refuce Silver to metallic silver
b) Convert metallic silver to metallic salt
c) Remove undecomposed silver bromide as silver thiosulphate
d) Remove reduced silver

I request the explanatory answer along with any reference to the question. I will be thankful

[Borek]

You have to show your attempts at solving the question to receive help. This is a forum policy, described in the forum rules.

Simple googling for details of the photographic process chemistry will give you the answer.

[Tittywahah]

Umair, it is tempting to answer and help you out here.  But there are answers to these questions all over the internet:  Tip, begin with photography sites especially darkroom.  Search Alternative photography, the chemistry of photography or the chemistry of the darkroom.  Search for chemicals in alternative processes - photography.  I have only listed a few search phrases, I am sure you can think of more, especially if you add at least one of your chemical names to the search topic phrase - you will target pretty much an exhaustive supply of reading material.