I forged a blade from a chain saw chain, ground it, and heat treated it. I then did the final grind and cleaned it with acetone then etched it in Muratic Acid. The problem is the blade near the handle etched beatifully but the tip just turned a silver gray with no contrast. You can see the layers but not the contrasting black and silver like the rest of the blade. Any ideas what I may have done wrong. Thanks William