![]() That is, 3 grams of 22 LZ per liter of solution. This particular pre-sensitized tissue was made by adding a 0.003% solution of 22 LZ to the pigmented gelatin solution. As you see, the ES of this step wedge is quite high. Perhaps other more common diazo type photo sensitizers.Īttached is a new scan of the step wedge print on photo paper, same as the one I posted earlier, but this one was cleared. Sized paper supports made with tissue sensitized with diazidostilbene, and My result was with 22 LZ, not diazidostilbene, but I believe there is reason toīelieve the clearing procedure might work with single transfer carbon prints on AndĮventually the yellow stain cleared completely!!Īcrylic coated paper, with the same result, yellow stain eliminated. The metabisulfite solution for another three or four more minutes. Noticed that one of the edges of the print was beginning to lighten. Purplish/brown color at first and I was just about ready to end the test when I Transfer carbon prints developed on sized paper supports. ![]() Washing it, and then placing it in a 5% solution of sodium metabisulfite, sameĪs the solution I keep on hand for clearing dichromate stain from single At that point Iįigured the print was totally lost, but decided to continue the process by first To darken, becoming a deep purplish/brown in about 2-3 minutes. When placed in this solution the print began Recommended for clearing Ultrastable prints. Potassium permanganate + sodium chloride, similar to the stock clearing bath A few of the solutions I tried did lighten the stain Oxalic acid, etc) I have on hand, to observe if there was any change in Solution, using a number of chemicals (potassium ferrycyanide, citric acid, My approach was to first place the print in a very strong first I was attempting to clear the yellowĭiazo stain from carbon prints developed on fixed out silver gelatin fiber I had an interesting finding this evening. Used with the Ultrastable system with diazidostilbene. Metabisulfite does not work, nor does the two part clearing solution This was the first iteration of the test. Long ES of over 3.0, with reflective Dmax of about log 1.70. Sample has some process issues, including bubbles, but very Sensitized tissue exposed for about ten minutes with a BL light source. 75ml of pigmented gelatin per 12X19” tissue. 5 mm, with 30 grams of BlackĬat pigment per liter of solution. Gelatin solution, poured to wet height of about. Pigmented gelatin solution prepared with a 10% Sample Two – Made with regular tissue, tray sensitized withĪ 0.025% solution of SCL 22 LZ. Some minor issues but overall a very good sample for the 5 th Negative was a Stouffer TP45, lapped in the center with Pictorico OHP. Single transfer carbon print to Yupo, with no clearing. The sample has an ES of about log 2.25, with DMax at Step The dark, and exposed for about eight minutes with a ULF-28 Continuous Wave The tissue was pre-sensitized by adding about 0.03% of the SCLĢ2LZ to the pigmented gelatin solution before pouring. Is similar to my normal tissue used with dichromate, but with about 50% heavierĪbout 150 ml of pigmented gelatin solution was used to makeĪ 12X19” tissue. Solution prepared with a 10% gelatin solution, poured to wet height of aboutġ.0 mm, with 20 grams of Black Cat pigment per liter of solution. Made at different times with different exposing light sources. NoĪttempt here to provide apple to apple comparison since the two samples were ![]() Series of test prints I hope to post made with non-dichromate sensitzers. He will be working withĪttached you will find two test prints I made with SCL 22LZ, In our testing of diazo type sensitizers my colleague and IĪre dividing the labor for our preliminary testing. Until that time the distinctive high relief look many monochrome carbon printers get with the use of single transfer to hard surface paper supports with dichromate sensitized tissue remains unique. It is possible that someone could come up with an efficient clearing agent for diazo type sensitizers for single transfer carbon prints developed on paper supports. For that reason people using diazidostilbene with carbon printing typically use double transfer, developing the relief on a plastic support, and then making a second transfer to a paper support. Diazidostilbene also gives a strong yellow stain in single transfer prints developed on paper supports. As you mention, diazo based screen sensitizers give a strong yellow (or orange) stain to virtually everything they touch, including the print. The result of his color work flow is based on following a very specific protocol, and once mastered, one would not likely abandon it without a highly compelling reason. ![]() I would assume that Tod Gangler is still using diazidostilbene (DAS) for his color carbon prints.
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