PURPLE MARBLE.
Colour the cover two or three times with hot purple liquid, and, when dry, glaire. Then throw on water, and sprinkle with strong vitriol-water, which will form red veins.
STONE MARBLE.
After throwing on the water, sprinkle boldly with the black liquid; then, with a sponge charged with strong brown, drop the colour on the back in three or four places, so that it may run down each side in a broad stream, and afterwards operate with vitriol-water on the parts the brown has not touched.
GREEN AGATE.
Sprinkle black, in nine times its quantity of water, in large drops over the whole surface of the cover, and when the drops unite apply on the back at regular distances the green liquid, so that it may flow on the boards and unite with the black.
BLUE AGATE.
Proceed as above, only substituting blue in place of the green, weakened with water according to the shade required.
FAIR AGATE.