1. _Black resist._
Take 1 gallon of the above black without the flour,
2 ounces of sulphate of copper,
1 ounce of muriate of ammonia, dissolve and thicken with
4 pounds of pipe-clay and 2 pounds of gum.
A Dictionary of Arts, Manufactures and Mines containing a clear exposition of their principles and practice · 第 65 / 421 题