Hello,
I'm just wondering is anyone can shed light on why gum bichromate printing does not require transferring to a final support like carbon printing does.
As I understand it, when exposed the cross linking of the gelatine in carbon printing occurs top-down and this is why the final support is necessary, however, I would expect the same thing happens in gum printing. Why then does the gum print not come off the support in development as it does in carbon printing?
My best guess is that the use of Gum arabic instead of gelatine is the reason for this difference, that the gum pigment can diffuse out whereas the unexposed gelatine layer cannot... Would I be correct in that assumption?
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