Dissolve 1 pound shellac in 1 gallon 95 per cent. alcohol; then add ½ pound best powdered ivory black, 5 ounces finest emery flour, 2 ounces ultramarine blue; mix well and keep air tight. When using stir frequently. If thick enough to show brush marks, add more alcohol; work quick with a fine brush.
TO MAKE A BLACKBOARD ON COMMON PLASTER.
Stop all cracks and holes with plaster paris mixed in glue size. When dry sandpaper until all is smooth; then paper the wall with white blank wall paper, butt the edges, put on with strong paste, and be careful to rub out all blisters. When dry prime with oil paint, then sandpaper with fine paper, and put on two coats of above slating. This makes an excellent blackboard. Boards which I made in this way twenty years ago are in good shape yet, and will last for years to come with an occasional repainting.
CHEAP SLATING, BUT GOOD.
Mix lamp black, 4 parts; ultramarine blue, 1 part, by weight, in turpentine, with sufficient good japan and a very little oil to bind it, then add one part by weight of fine pumice stone. Have it thin enough to flow on and not leave brush marks.
WATERPROOF OIL RUBBER PAINT FOR CLOTH.
Melt 2½ pounds of india rubber in ½ gallon of boiled oil by boiling. If too thick, add more oil; if too thin, add more rubber, and a little japan to dry it. Apply warm.
TO CLEAN PAINT.
Have some whiting on a plate, then dip a piece of flannel in warm, soft water and squeeze nearly dry, then take up some of the whiting by dipping the flannel in it, and rub the paint until it looks clean, then rub dry with a soft cloth or chamois skin.