It removes undeveloped silver halides from photographic emulsions. This leaves the silver behind, giving you a prnt that won't eventually turn black (because silver halides will eventually turn black on their own) or a negative light will pass through.
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Hypo is a reducing agent when combined with Na.
hypo
Sodium Theosulfate AKA Hypo is one form of fixing agent
Retail refers to photography commissioned or purchased for personal use.
Online media can have unlimited use of Photography.