RECIPES FOR COLORING MORTARS.—The following recipes for coloring cement mortar have been found reliable; the weights given being weight of coloring matter per bag of cement and for a 1-2 mortar:
Brown Stone: 4 to 5 lbs. brown ochre or ½ lb. best quality roasted iron oxide.
Buff Stone: 4 lbs. yellow ochre.
Red Stone: 5 lbs. raw violet iron oxide.
Bright Red Stone: 5½ to 7 lbs. English or Pompeiian red.
Blue Stone: 2 lbs. ultramarine blue.
Dark Blue Stone: 4 lbs. ultramarine blue.
Slate: Lamp black ½ lb. light slate; 4 lbs. dark blue slate.
Light Terra Cotta: 2 lbs. Chattanooga iron ore.