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The quick answer for cold blues is nothing. A lot of folks will slop on cold blue so a gun looks good and then take pictures to show off the cheap and easy blue job they did. Impressive. They never show pictures of the gun after a bit of handling, though.
Belgian Blue is rust blue; done right it gives excellent results. Almost all European guns made before the 1930's (Lugers, Mausers) were rust blued.
Jim
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