Uploaded January 2019 | Updated September 2026, 2 weeks ago

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Gun blue or blued steel can refer to a lot of different steel coatings used to protect metal from corrosion, like Black Oxide. What if they are on cutlery like kitchen knives and you want to use them on food? Is cold blue toxic? Is black oxide toxic? Is it safe to use these homemade coatings? All questions answered!

Link to the PubMed Article
ncbi.nlm.nih.gov/pubmed/17127727

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