[alt-photo] Re: no shrink, no size tricolor gums

[Loris Medici]

If these are noon sun exposures at Riyadh, maybe they're too strong indeed.
I remember someone referring to 30-40 seconds exposures under sun, and at
much higher latitudes! Of course, their dichromate strength / pigment load
and whatnot could be way different than yours. Anyway, I'm sure you'll find
the correct parameters, it's a question of a little testing and
evaluation... Remember the principles of gum printing.

Good luck!
Loris.


-----Original Message-----
From: alt-photo-process-list-bounces at lists.altphotolist.org On Behalf Of
Trevor Cunningham
Sent: Tuesday, September 14, 2010 5:01 PM
To: The alternative photographic processes mailing list
Subject: [alt-photo] Re: no shrink, no size tricolor gums

My exposures are between 1 and 2 minutes only. I'll start with decreasing
the dichromate and go from there. Thanks!

On 9/14/10 3:30 PM, Loris Medici wrote:
> Have you tried to decrease exposure and/or dichromate strenght? Seems 
> like you're overexposure (either too long exposure time or too much 
> dichromate, maybe both...) to me.