COLOURED COAL.
Coloured coal is finding favour among dealers in America to indicate superior grades. Besides the trade-mark advantages, coloured coal, it is said, enables the distributor to mark definitely the product as. that of a certain blend. Coal, it seems, may come from several different mines, and when mixed in the proper proportion it produces better results. The finding of a colouring matter for coal was not easy. Painte are ruled out because of the odour. The colour is applied in a water solution. After drying it is impervious to the action of water. . '.'■'■ „ -
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https://paperspast.natlib.govt.nz/newspapers/AS19321001.2.231
Bibliographic details
Auckland Star, Volume LXII, Issue 233, 1 October 1932, Page 10 (Supplement)
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95COLOURED COAL. Auckland Star, Volume LXII, Issue 233, 1 October 1932, Page 10 (Supplement)
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