Bluing.
10 ib saltpetre, 1 1b black oxide of manganese. Heat (in a crucible) to a point that will ignite pine saw dust, stir thoroughly. Suspend work in a wire basket (keeping basket in motion) until proper colour is obtained.
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https://paperspast.natlib.govt.nz/periodicals/P19070401.2.12
Bibliographic details
Progress, Volume II, Issue 6, 1 April 1907, Page 209
Word Count
40Bluing. Progress, Volume II, Issue 6, 1 April 1907, Page 209
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