PSA: A batch of 'cold blue' solution from a vendor in Phoenix turned a customer's barrel purple.

Emma Smith · 2026-03-28T02:55:04.840917+00:00

I used it on a 1911 slide last Tuesday, followed the instructions exactly. The metal came out with a deep purple tint instead of the usual black. Anyone know what causes this reaction with certain steels?

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PSA: A batch of 'cold blue' solution from a vendor in Phoenix turned a customer's barrel purple. | Gunsmiths - The Community Guide