I have made a bunch of kichen knives from 1095 and 1084 and I use them every day.
A couple of them have begun to take on a very light blue or straw color. It's not completely even, but it's definitely there. They look similar to colors you get when tempering steel, but not as strong.
The blades havnot been exposed to anything hotter than what comes out of a hot water faucet or any chemicals other than dish detergent.
I would like to create this finish on a few blades, but don't know why or how it came about and would appreciate any suggestions.