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As I said..... I haven't colored steel in that temperature range. I was told by Julia Marks that that is the range they use to color their bolsters. I would have serious doubts that you could get a deep blue at the temperature. I do, however, color at well below the 600 degree mark as I've stated earlier. You need a mixture of common higher carbon and lower carbon steels to really bring out the pattern in damascus steel with color. 01, 1095, 1075 and 1056 should all give you good results within draw time to a deep blue at a reasonable temperature.
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