Thank you Ray on my first restoration project the metal to be case colored was wet polished with 600 grit emery and it did achieve that nice translucent appearance. After it was colored it was coated the case colors with clear lacquer as Dr. Gaddy recommended. I couldn't find the product he recommended so I used Testor model airplane builders lacquer thinned 15 to 1 and achieved a beautiful tough transparent protective coating for the colors. That was over 20 years ago and the colors have not yellowed or flaked off.
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