Heinz,
The Maglight test involves shining a bright light onto a gun's blued surface to illuminate its deep characteristics. Rust bluing (particularly) develops a brownish character (a rusting phenomenon) over time, which is only visible under extremely bright light. A blued surface which does not exhibit this color has been blued relatively recently. (The Simichrome test reveals the same characteristic in a different manner.)
Its called the Maglight test because a small Maglightâ?¢ flashlight is convenient to carry around--say, at a gun show--to make this examination. I wondered if Blue Wonder Gun Cleaner altered the rust characteristic.
There has been more than one discussion about both the Maglight and Simichrome tests here on this forum, a search should reveal them.
I don't understand your chrome parts reference??
--Dwight
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