Response to water pre-soak

I do not know which film you used, but you obviously got the antihalation backing in the presoak. Some films rely on this to prevent light spreading through the emulsion, if the manufacturer does not use a pronounced gray base. Without these measures you would have decreased sharpness and accutance. Some films have huge problems with light spreading through the emulsion, as can be seen with TMAX 100. Its immense fuzzines obviously is based on "light piping". An exposed silver halide passes the light information on to the halides around it, thus decreasing sharpness, resolution and accutance. While Ilford trusts the gray base, Kodak seems to prefer the antihalation backing. Also Efke has one. The Efke one is green for expample. It is necessary that this backing disolves during development, otherwise you would have a semi transparent film. These backings are water soluble and first traces will be seen in the presoak. The green colour will not affect development in any way.

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