zinc formaldehyde sulfoxylate
the chemical that removes the color from a dischargable substrate.
zinc yellow
a yellow pigment consisting of zinc chromate.
sometimes be removed Gelatin may become badly by placing the negative swollen due to the temperature of in a10-percent solution a solution or wash water, and upon of formaldehyde for a shrinking, ...
Such a hardening bath often used aldehydes, such as formaldehyde and glutaraldehyde. In modern processing, these hardening steps are unnecessary because the film emulsion is sufficiently hardened to withstand the processing chemicals.
 See also: Space, Camera, Light, Stand, Negative
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