RE: Satista question
Loris, Now I am consulting with my notes. About platinum as a sensitizer. 1 drop of 5% solution for 10 drops of 40% FOA is a good starting point. Less platinum will result in a more brown image, more platinum will shift the tone toward black. Palladium addition will result in a more brown tone of the print. Palladium will result ina yellow stain on some papers, very difficult to clear. I have some great looking images on COT320 using gold/FOA as sensitizer. Try 1 drop of 1.5 to 3% solution per 10 drops of 40% FAO. The tone is brown with a hint of purple or sepia, quite different from VDB brown. A side note stated that gold might precipitate making nice coating difficult. Despite that some prints look fantastic. My clearing bath is a mix of Na4EDTA, citric acid and metabisulfite. Final fix is just about any thiosulfate as satista prints do not bleach in the fixer. I was wrong about no noble metal in the sensitizer. Long exposures with just plain FAO and developmnet will result in a low contrast image. Humidity is a variable, but my practice is to dry with a heat before exposure or for storage. I kept dry and sensitized papers (with FAO and Pt) for weeks before exposure. No apparent change. Hope that helps Marek
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