This section is from the "Henley's Twentieth Century Formulas Recipes Processes" encyclopedia, by Norman W. Henley and others.
The following colors and minerals, mixed in the proportions given and then ground to fine powder, make excellent dry paints, and may be thinned with turpentine oil, and a small percentage of cheap varnish to consistency required.
Yellow ocher........ 44 pounds
Whiting......,..... 6 pounds
Oxide of zinc........ 5 pounds
Plaster of Paris...... 0.5 pound
Yellow ocher........ 26 pounds
Calcined copperas.... 4 pounds
Red hematite........ 1.25 pounds
Best silica........... 7 pounds
Whiting............ 18 pounds
Oxide of zinc........ 30 pounds
White lead.......... 6 pounds
Whiting............ 12 pounds
Bone black.......... 0.25 pound
Yellow ocher........ 2 pounds
Indian red.......... 25 pounds
Crocus martis....... 7 pounds
Oxide of zinc........ 6 pounds
Whiting............ 6 pounds
Y'ellow ocher........ 25 pounds
Whiting............ 18 pounds
Umber............. 4 pounds
Oxide of zinc........ 7 pounds
Purple oxide of iron .. 1 pound
Crocus martis....... 30 pounds
Whiting............ 20 pounds
Hematite........... 3 pounds
Silica............... 6 pounds
Venetian red........ 2 pounds
Yellow ocher........ 40 pounds
Whiting............ 10 pounds
Oxide of zinc........ 8.5 pounds
Sulphate of barytes.. . 1 pound
Shellac. . .......... 1 pound
Alcohol............. 1 gallon
Lampblack (fine quality).......... 4 ounces
Powdered emery..... 4 ounces
Ultramarine blue.... 4 ounces
Dissolve the shellac in the alcohol. Place the lampblack, emery, and ultramarine blue on a cheese-cloth strainer, pour on part of the shellac solution, stirring constantly and gradually adding the solution until all of the powders have passed through the strainer.
Mix 1 part Prussian blue and 1 part chrome green with equal parts of gilders' size and alcohol to a thin cream consistency. Apply with a large, stiff brush and after an hour a second coat is given. After 24 to 48 hours smooth the surface with a felt cloth. This renders it rich and velvety. The shade must be a deep black green and the quantities of the colors have to be modified accordingly if necessary. Old blackboards should be previously thoroughly cleaned with soda.
 
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