From: pete (temperaprint@blueyonder.co.uk)
Date: 02/09/03-09:47:11 AM Z
Chris,
>
> Yes, these are the two points I found interesting in the whole original
> convo--that the orginial test was used with 100% dichro, and we were taught
> in my class that the amount of pigment produced the stain, so to lessen the
> pigment.
In my opinion there are two staing processes at work here,
one-:the stain produced by the pigment particles themselves for instance
Phthalocyanine Blue can give massive stain whereas Cerulean blue does not.
And two-: the concentration of the pigment in mixture the more pigment mixed
in a given volume increases contrast and reduces emulsion sensitivity to
light, and also at the same time shows a corresponding reduction in the
apparent pigment stain
There is also the dichromate stain at work but that is another story
Pete
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