What exactly is the difference between liquid bluing and hot salt bluing?

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The ADVICE- if you decide to cold blue, do not use the birchwood casey blue, but their rust and blue remover is ok, an do not let the rust/blue remover touch any springs or they WILL break. Brownells oxpho-blue is the BEST cold blue on the market, and is easy to use/apply. now for the ANSWER- Bluing may be applied, for example, by immersing the steel parts of the gun to be blued in a solution of potassium nitrate, sodium hydroxide, and water heated to the boiling point. Similarly, stainless steel parts of the gun to be blued are immersed in a mixture of nitrates and chromates, similarly heated. Either of these two methods is called hot bluing. There are many other methods of hot bluing. Hot bluing is among the most effective forms of bluing, providing the most permanent degree of rust-resistance and cosmetic protection of exposed gun metal. Rust bluing was developed between hot and cold bluing processes. It was originally used by gunsmiths in the 19th century to blue firearms prior ... more
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