As we know the temperature of the developer is critical for film development. Usually it's 68F/20C.
Will the temperature of stop-bath and fixer also affect the final result of the image?
If so what is the suggested temperature?
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The rule of thumb is to keep all processing temperatures as close as possible to each other including the water rinses.
The problem that arises with temperature fluctuation is the stress it puts on the emulsion (a colloidal suspension of silver halide in gelatine). Uneven swelling and shrinking due to thermal changes can cause reticulation (failure) of the gelatine structure resulting in a distinctive crazing pattern. The affected areas are permanently affected.
All fluid baths should be close to the same temperature including water rinse, wash water, and washing aids. Film has multiple coats of material both front and back. Each layer, (there can be a dozen or more), has a different coefficient of expansion / contraction. If the temperature range is extreme, these various layers will slide. The least problem will be film curl, the worst, reticulation (cracking of the emulsion). One subtle result of just a few degrees variation is insipid reticulation, a slight worsening of the grain structure.