Thinking that I should probably give my steel crankshaft parts a coat of shellac to keep them from rusting, I thought I'd try an experiment with a mixture of shellac and a few drops of yellow food coloring.
I brushed two coats on a scrap of aluminum rod, one coat on the top of a razor blade, and two coats on part of a chrome-plated shaft, a ball bearing housing (avoiding getting shellac inside), a piece of steel from a ratchet, and part of a slotted screwdriver shaft. I'm not sure how well the colorant will resist fading - especially prolonged sunlight exposure, but for the interior organ parts I may give it a go.
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