Bluing.
A cheap way to blue small steel pieces — put core sand in a babbit ladle, heat hot, put work m, shake the ladle over the fire, until the required colour is obtained.
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https://paperspast.natlib.govt.nz/periodicals/P19070401.2.21
Bibliographic details
Progress, Volume II, Issue 6, 1 April 1907, Page 220
Word Count
33Bluing. Progress, Volume II, Issue 6, 1 April 1907, Page 220
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