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Sizing gum layers
Hello.
I've heard it is a good idea to size each layer when doing multiple layer gum bichromate pictures to stop bleeding etc. and wondered if clear gesso would do the trick ?
SPG
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I've never sized between layers of gum. I have had problems with gum flaking off when I double coated with gelatin size. (Had extra. Thought it was clever to use it up. It wasn't.)
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I only size once in the right after preshrinking the paper. With diluted Polyvinyl Acetate. I've never had a problem with staining or bleeding. I used Gesso, granted it was pigmented, but didn't like how it looked. I might try an albumen size later, when I run out of the PVA.
If you have issues with bleeding, it might be that your emulsion is too thick, and gravity compresses the emulsion before it dries.
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I prefer Gum without layer of gelatin and directly on the watercolour paper
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