Jack:
On the SW, the patchy browns and the lack of color edge breaks are the clue along with how the colors lay and with constant color around all screw holes etc.......besides of course knowing factually that Fox used a
"good" cyanide process.......
On examples WITH lot's of remaining color or new restorations:
Bone/Charcoal CCH has color breaks around the sharp edges and some areas are usually void of color, especially around screw holes, holes for thru pins, axles etc............................
BUT NOT SO with cyanide CCH where most areas are NOT void of some type of color, "even around screw holes and holes for axles etc".........
The H & R and S311 are very low grade processes of cyanide and look more like close waves than blotches.......
So in summary....IF THE COLOR RUNS UP TO AND AROUND ALL THE SCREW AND AXLE HOLES AND CORNERS WITHOUT COLOR VOIDS, THEN IT IS CYANIDE CCH.......IF THERE ARE COLOR VOIDS AROUND THE SCREW HOLES, SHARP EDGES, PIVOT PINS ETC., THEN IT IS BONE/CHARCOAL CCH..... Examples:
Restored Bone Charcoal CCH, note the color breaks around the sharp edges and holes created by temperature differences (retained heat) during the quench:
Factory Fox Cyanide CCH, note the full color patterns without breaks, even on the sides and corners and around all the holes:
Best,
