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Re: Confusing Speed and Sensitivity,(was Potassium vs. Ammonium Dichromate), (was Re: Clearing Gum Prints)



 Sarah Van Keuren wrote:

>Judy, I think we're saying the same thing. Gum bichromate would have a
>longer tonal scale like carbon printing if it weren't for the fact that gum
>prints are exposed from the top instead of from behind.

>
>I look forward to the upcoming issue of P-F where you show how length of
>scale can be varied by increasing or decreasing pigment. It makes sense to
>me from my own experience.
>
>Sarah

Sarah,

Thanks for these interesting comments. In carbon contrast can also be
varied by increasing or decreasing the amount of pigment in the coating
solution.

Sandy King