Re: pigment color affecting exposure

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From: Dave Rose (cactuscowboy@attbi.com)
Date: 04/17/03-09:49:05 PM Z


FWIW, looking at my gum test prints (made at the same exposure time), the
blue and green do print a slight bit faster than red and yellow.

Dave in Wyoming

----- Original Message -----
From: "Christina Z. Anderson" <zphoto@montana.net>
To: "Alt list" <alt-photo-process-l@sask.usask.ca>
Sent: Thursday, April 17, 2003 8:50 PM
Subject: pigment color affecting exposure

> Question:
> What is everyone's opinion about this: "theoretically, the color of
> the pigment does not affect the sensitivity of the emulsion since the
action
> of the light is on the sensitizer and the gum"....that the only way
pigment
> affects exposure is in its density of holding back light, either by how
> concentrated it is used in the mix or by the inherent density of the
pigment
> itself (I suppose what we would term "covering power").
> I guess I am asking this: do you gum or carbon printers always find
in
> practice blue exposes more quickly, and so on down the line in order like
> this: from shortest to longest times in this order: blue, green,
violet,
> orange, black, red, yellow, brown.
> Or is that not true?
>
>
>


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