Paper seems to make the biggest difference. Bockingford hot pressed 300g watercolour
has the least issue with staining For me. I also additionally size it with liquitex matte medium at a dilution of 1:10. This seems to keep things clean. Also I’ve learned that some watercolours just stain...
The cloisters are 3 layers. The negatives are CMYK digital transparencies separated in photoshop. I haven’t applied and specific curve adjustment. I hope to experiment with using scanned RGB filtered black and white film negatives eliminating the need for photoshop.
Thank you. I’m fascinated by the bichromate process but terrified of the toxicity and the staining issues with diazo are problematic. I’ve been trying to get results in a less scary way and this is so useful.
Hi, I don’t know if it’s very useful but I’ve been doing the ammonium ferric citrate thing with both gelatine and casein and have had reasonable results. The bobbins use casein, the flowers are gelatine based and the cloisters are gelatine and graphite.
After a long time lurking I thought I’d say Hi! I’m in the UK and have tremendous fun with Zeiss box cameras, a beaten up Rolleicord, and my Contax iia. Currently I’m experimenting with using non toxic alternatives to gum bichromate and gum oil using casein, gelatine and ammonium ferric...
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