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Bluing small parts

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I’ve used charcoal bluing and nitre salt bluing. Nitre salt bluing provides the most even coloring but to be honest it’s more of steel tempering method than a bluing method. But the end results are very a attractive second blue.
 
cold Bluing or Rust Bluing doesn’t work well on 4130 and 4140 alloy steels, it actually turns them a violet color. Nitre bluing, and charcoal bluing are the best methods for some steels.
 
Sorry Nick, I hadnt heard of melting just the salts. Thanks for the video. Thatd take an awful amount of heat to warm tanks large enough for 24 barrels. We used salts from Brownells and also another manufacturer I cant think of right now. Just to clarify about adding water to the salt solution. It was done with a long handled ladel. Lowered down into the tank and rolled over, not dropped from above.
 
Sorry Nick, I hadnt heard of melting just the salts. Thanks for the video. Thatd take an awful amount of heat to warm tanks large enough for 24 barrels. We used salts from Brownells and also another manufacturer I cant think of right now. Just to clarify about adding water to the salt solution. It was done with a long handled ladel. Lowered down into the tank and rolled over, not dropped from above.

I only use melted salts for small parts, screws, but its a great method of tempering parts including springs. Works really good on 1095 springs.
 
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