we are cutting thin steel ( 26 G) on a 700 watt fiber laser.. the designs we are cutting are very detailed with very small holes and in the areas with the most detail < we are finding the suface of the metal is discoloring.any suggestions on something to coat the metal with to minimize this? we are using compressed air and no sheid gas and we would like to keep it that way...its not the edges I care about, its the surface.

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