U of S | Mailing List Archive | alt-photo-process-l | Re: How many gum layers (Re: ferri sesquichlorati)

Re: How many gum layers (Re: ferri sesquichlorati)

See Katherine, I am  totally confused by this  last post...I had decided not to post further on the topic, but I will only  say that your comments below leave me totally confused as to what you are saying ...now you are saying the curve does have some importance even to developing a curve for a specific pigment and pigment load.... yet in your last post  you said that you used negatives with no curve or density range control....

I must have way too much  of a need for order in my universe!   hehehehehehhehe

Best Wishes,
Mark Nelson

Precision Digital Negatives - The System
PDNPrint Forum at Yahoo Groups

In a message dated 10/25/06 12:50:32 PM, kthayer@pacifier.com writes:

Keith, I'm not sure it would be helpful for someone to "share their 
curve" since it's my understanding that a curve is specific to a 
specific emulsion and printing conditions.  So the curve I've been 
developing is only for Prussian blue (and probably M. Graham Prussian 
blue at that) at a specific gum/pigment ratio,  mixed 1:1 with 
saturated ammonium dichromate, and printed on Arches bright white 
sized with gelatin and glyoxal, under an EBV photoflood for 2 
minutes, at a temperature of 60 degrees F  and 75% RH, from an inkjet 
negative printed on the specific kind of cheap transparency I'm using 
(whatever it is).  Any deviation in that protocol would necessitate 
drawing up a new curve, because the curve is intended to fit the 
protocol exactly.