Pawel, have you ever taken either Rockwell, or Brinell hardness tests after your temper cycle?
Second set of four pictures is very typical of Purdey and H&H.
Colors of your work may not replicate Parker CC, but they are a lot nice than some work I have seen. Colors can be affected by packing materials. Often, Bone, Charcoal, Leather, and other organic materials were mixed. Borax was used by both Colt and Winchester in the 1870-1890 era.
Short soak time at upper critical temperatures can cause varying colors on frames where section thicknesses vary. Temper/ Stress Relieveing cycle is important to reduce stresses developed in the Normalize and quench cycle, especially if quench medium is water, not oil or glycol.
We heat treated 7200- 10,000 tons of carbon, low alloy and stainless steel per year, in both inert, and atmospheric furnaces. One quench tank was as big as our swim club pool. We also sold a lot of heat treat pots to Colt, in West Hartford. I got to know the heat treat forman over there pretty well. Sadly, they're gone now.
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