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

• To: alt-photo-process-l@sask.usask.ca
• Subject: Re: Confusing Speed and Sensitivity,(was Potassium vs. Ammonium Dichromate), (was Re: Clearing Gum Prints)
• From: Sandy King <sanking@hubcap.clemson.edu>
• Date: Sun, 01 Apr 2001 10:52:21 -0500
• Comments: "alt-photo-process mailing list"
• In-reply-to: <200103311047107.SM00284@[198.139.119.3]>
• Reply-to: alt-photo-process-l@sask.usask.ca

 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

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