What is the solution used to blue a gun barrel made of?
Md Ariful Islam
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Dr. Md Rushad Rahman
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There are different solutions on the market. "Du-Lite" is a commercial solution that is sold to professionals. It's also used by gun manufacturers like Colt or Smith and Wesson. Cold blue solutions usually use a caustic solution that "rusts" steel to turn it a blue-black color. It's then neutralized with another solution and washed with hot water, then oiled.
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