This is 1 gal of 14 Baume liquid Gum Arabic from Photographers' Formulary. It is a colloid commonly used in gum printing methods in conjunction with a dichromate and pigment solution to produce an emulsion for UV exposure. Also known as acacia gum, gum arabic can also be used as a binder in painting, an additive in ceramic glazes, and for protecting and etching lithographs.
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Just what I need for gum bichromate printing.
I love photographer formulary gum for my gum bichromate alternative process photography work. I have been using it for years. One thing of note is that I do not order it in the winter... I am in CA and if it is shipped through freezing temperatures and freezes, I think that changes the chemical makeup somehow and slows down the exposures. To fix this I order enough in the summer to last the year.