Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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sun spots

A variation of the Turkish, snail, or wave marbles, consisting of a color or colors which are made to spread out in a raylike effect somewhat like the rays of the sun. The effect is produced by adding a small amount of kaolin (in water) and boiled potash to the colors. The colors are then dropped on the size, a drop of potash water is dropped on, causing the color to contract, followed by another drop of the color directly over the first, which causes the color to radiate outward. (264 )

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