http://www.stkildachemicals.co.za/pd_bcp.html Web3 apr. 2012 · Mar 29, 2012. #9. The 'FIXER' chemical used in developing black & white photographs can be used as a blacker for steel items. Get them very clean, heat the fixer to just under boiling and suspend the part in it. Dunk time determins the depth of black. Use pyrex vessel not a metal vessel to heat the fixer.
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