Roland,
Sorry, it was an addendum to my previous message, Gum Arabic could be used as the emulsion base, as can egg yoke, cream etc. when mixed with the potassium dichromate, once mixed they will all polymerize after exposure to UV or sunlight, after washing the unexposed areas away it would be a good idea to expose the board to UV again, this will give an extra hardening phase,as one does to polymer plates used in hot foil presses, not sure how these emulsions will stand up to etching chemicals though........
The baking phase i mentioned was to dry the freshly applied emulsion, just to speed up the drying before dust settles on it whilst wet.
David
--- In Homebrew_PCBs@yahoogroups.com, "Roland F. Harriston" <rolohar@...> wrote:
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> I Gum Arabic photosensitive? And does it polymerize (harden) after being
> exposed to light?
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> Roland F. Harriston, P.D.
> ∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗
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> David wrote:
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> > Another emulsion base for homebrew resist is Gum Arabic......
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