Re: Lithium palladium vs. normal palladium
But Witho is double coating with half-strength solutions (or using two times water - if you like). So the final amnt. of iron sensitizer and Pd double salt remans the same (therefore should act the same). I had to increase exposure times back when I was double coating Classic Cyanotype to get better Dmax - but the solution wasn't half strength, it was full strength. Probably it was due to the extra filtering effect caused by more concentrated coating solution... BTW, 2ml for 12x20 sized print on COT320 is very little by my standards. I'd use about 2x solution for that size. I use 0.2ml to 0.15ml per 10 square inches depending on the RH and coating method (glass rod / brush). See below: 12 x 20 = 240 / 10 = 24 * 0.2 = 4.8ml, 12 x 20 = 240 / 10 = 24 * 0.15 = 3.6ml. See? Even at 0.15ml per 10 square inches, I use about 80% more than Witho!? Regards, Loris. Quoting Ender100@aol.com: Witho, Somewhere in the back of my pea brain I remember someone, I think Sandy King, saying that when double coating, he had to increase his exposure time?could this be an issue with your DMax? Best Wishes, Mark Nelson Precision Digital Negatives - The System PDNPrint Forum at Yahoo Groups www.MarkINelsonPhoto.com In a message dated 1/18/07 10:33:34 AM, info@witho.nl writes:Yes, it is, 12x20 inch and little sensitizer. That is why I lack some Dmax, I think, just because I do not use enough sensitizer. I always double coat with half the strength of the sensitizer. It gives me lots of time to make very smooth coatings and cope with the hygroscopic effect of the lithium. So I go to 1.35 with 1 ml metal solution and 1 ml AFO 60% (single coat) or double coat half the concentrations. Witho
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