If you search YouTube there are many good videos for black oxide coating, very helpful for me to see the process, materials and supplies suggested.
A few I really liked on how to chemically phosphate bolts, the first being rather long but very informative, the second a update, the third is newer.
https://www.youtube.com/watch?v=iOciisXubsk
https://www.youtube.com/watch?v=rEtgrwhR4Qg
https://www.youtube.com/watch?v=TFfJwNvK1iY
Frank
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Poncho Huggen, Gear Snatchen, Posi Piro.
