Allen:
Here are some observations on cyanide vs. bone charcoal re-coloring made by Bruce Day, posted on this forum a while back.
1. Del Grego's do not do their own color case hardening. They take them to a contractor in nearby Herkimer for cyanide process or more recently, to Turnbull for charcoal process if selected by the gun owner.
2. Case colors can be muted or removed by hand polishing over the course of an evening while watching television.
3. The color patterns of cyanide case colors depend on the technique of the person doing the work. Results range from near charcoal case colors to the discussed tiger stripes. The process uses a liquid bath and the tiger stripes result from multiple depth immersions. Similar to dyeing an Easter egg.
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