This colour is but little used, on account of its great specific gravity, and seldom without being combined with some other colour. It is a preparation of mercury, and, though nominally at a much lower price than lake, yet so little of it goes to a pound, it comes nearly as dear as that article.
ROSE-PINK.
This is a very useful though common colour. It is composed of chalk or whiting coloured with Brazil wood; consequently it is what is termed a fugitive colour, the pink very quickly fading on exposure to the atmosphere or to heat. When combined with indigo or a little Chinese blue it makes a good purple.
BURNT OCHRE.
This colour is obtained in its native state from pits dug in the earth in the neighbourhood of Oxford; hence, it is called Oxford ochre, and sometimes stone ochre. It is in fact a kind of clay, and when made red-hot turns to a kind of red colour. It is one of the most useful colours, and, as the price is low, is extensively used. With the addition of a little black it makes a good brown; with a little blue or indigo it makes a good olive; or it is a good colour used by itself, and is not liable to change.
WOOD LAKE.
This is a preparation of peach-wood, and has only been introduced of late years to the notice of marblers. It is manufactured at Birmingham. This colour is an exception to the rule, as it is sold in the pulp or damp state, and may be mixed and even used without grinding, being made almost exclusively for marbling. It is the best red that can be used for general purposes, and for appearance comes next to the drop lake.
CHINESE BLUE.
This is a very beautiful but not a very durable colour. It is, however, an almost indispensable one to the marbler, as it will produce nearly every shade of blue by the addition of certain proportions of white. This colour requires to be particularly well ground, as indeed do all the blues. It is also sold at some places in the pulp or damp state. There are some very good damp blues made.