OK Pete, first why would one take the steep/time to blue the area inside the deep recesses of the checkered part, clean the blue of the areas that were over worked/splashed with blue solution and then straw it....I bet that if you took the safety lever off the gun the back would be just as straw color as the front, but what you are looking at are the raised points that are smaller/thinner than the mass of the lever body and took on a darker color before the heaver/thicker mass of the lever reached the straw color....so it got darker faster
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