Important: Safety Warning
This page describes trade processes that use dangerously toxic materials such as cyanide solutions, mercury amalgams, or strong acids. These processes require training, equipment, and precautions far beyond what the text describes.
This information has been left in for historical purposes but should not be acted upon.
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Liquid Blacking (Ivory-black cwt crude molasses)
Ivory-black, 3 cwt.; crude molasses, 2 cwt.; linseed oil , 3 gallons; oil of vitriol, 20 pounds ; sufficient water to finish as in No. 3088. 3092. Bryant and James' Patent Liquid Blacking. 18 ounces caoutchouc are to be dissolved in about 9 pounds hot rape oil. To this solution 60 pounds of fine ivory-black and 45 pounds molasses are to be added, along with 1 pound finely ground gum-arabic, previously dissolved in 20 gallons vinegar. These mixed ingredients are to be finely triturated in a paint-mill till the mixthe mix- To this ture becomes perfectly smooth. To this varnish 12 pounds sulphuric acid are to be now added in small successive quantities, METHOD OF MARBLING BOOKS. with powerful stirring for half an hour; at | second mixture, while quite hot, is stirred inthe end of which time 3 pounds of finely- to the first; and then a further addition of ground gum-arabic are added; after which 10 ounces gum Senegal, dissolved in about 3 the stirring is repeated half an hour every quarts water, is added. This compound is day for 14 days longer, when the liquid black- the stock; for use, it should be diluted with ing is ready for use.