China Clay.
Pipe-Clay.
Flake White.
Paris White.
DROP LAKE.
This is the most beautiful, but the most expensive, of all the reds, and is used only for book-edges and the most superior kinds of work. There are different shades of this colour, viz.:—scarlet, crimson, and purple. The scarlet is the most expensive, and looks the best on edges, possessing a brilliancy which no other colour will produce; but there is a great quantity of a very inferior kind of drop lake about, which is of no use whatever to a marbler, for, when it comes to be worked, it is found to possess no body.
In order to ascertain whether the article about to be purchased will answer, take a piece of the colour, and, breaking it, apply the broken part to the tongue. If it adhere to the tongue, it is very doubtful whether it will do; but if it hold up the moisture without any inclination to adhere, it may be tried with better expectations. This colour is sold in the form of small cones or drops, from which it derives its name, and is a preparation of cochineal; therefore the value of it depends much upon the price of that article.
VERMILION.