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 www.MarkINelsonPhoto.com 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. |