Dry Bases for Paints

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.

Buff

Yellow ocher........   44 pounds

Whiting......,.....     6 pounds

Oxide of zinc........     5 pounds

Plaster of Paris......       0.5 pound

Brick Brown

Yellow ocher........   26 pounds

Calcined copperas....     4 pounds

Red hematite........     1.25 pounds

Best silica...........     7 pounds

Whiting............   18 pounds

Gray

Oxide of zinc........   30 pounds

White lead..........     6 pounds

Whiting............   12 pounds

Bone black..........       0.25 pound

Yellow ocher........     2 pounds

Crimson

Indian red..........   25    pounds

Crocus martis.......     7    pounds

Oxide of zinc........     6    pounds

Whiting............     6    pounds

Vandyke Brown

Y'ellow ocher........   25    pounds

Whiting............   18    pounds

Umber.............     4    pounds

Oxide of zinc........     7    pounds

Purple oxide of iron ..     1    pound

Blood Red

Crocus martis....... 30    pounds

Whiting............ 20    pounds

Hematite........... 3    pounds

Silica............... 6    pounds

Venetian red........ 2    pounds

Drab

Yellow ocher........   40 pounds

Whiting............   10 pounds

Oxide of zinc........     8.5 pounds

Sulphate of barytes.. .     1 pound

Paint for Blackboards

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.

Dark-Green Paint for Blackboards

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.