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A pigment formed by combining some coloring matter, usually by precipitation, with a metallic oxide or earth, esp. with aluminium hydrate; as, madder lake; Florentine lake; yellow lake, etc.

on of various impurities. It is used as an ingredient of printers' ink, and various black pigments and cements.

lly, to make smooth by rubbing in a moist condition between hard surfaces, as in grinding pigments.

A black pigment which dries rapidly when mixed with oil, and is of intense body. Fairholt.

, the fused and crystalline form of which is called litharge; lead ocher. It is used as a pigment.

A morbid condition in which the blood contains black pigment either floating freely or imbedded in the white blood corpuscles.

A black pigment found in the pigment-bearing cells of the skin (particularly in the skin of the negro), in the epithelial cells of the external layer of the retina (then called fuscin), in the outer layer of the choroid, and elsewhere. It is supposed to be derived from the decomposition of hemoglobin.…

An indue development of dark-colored pigment in the skin or its appendages; -- the opposite of albinism.

A tumor containing dark pigment.

The morbid deposition of black matter, often of a malignant character, causing pigmented tumors.

The power og changing color at will by the expansion of special pigment cells, under nerve influence, as seen in many reptiles, fishes, etc. Cope.

from plants or animals. -- Mineral oil. See Naphtha, and Petroleum. -- Mineral paint, a pigment made chiefly of some natural mineral substance, as red or yellow iron ocher. -- Mineral patch. See Bitumen, and Asphalt. -- Mineral right, the right of taking minerals from land. -- Mineral salt (Chem.), a salt of a min…

A heavy, brilliant red pigment, consisting of an oxide of lead, Pb3O4, obtained by exposing lead or massicot to a gentle and continued heat in the air. It is used as a cement, as a paint, and in the manufacture of flint glass. Called also red lead.

A pigment of a green color, the chief constituent of which is oxide of chromium.

(b) Stannic sulphide, SnS2, obtained as a yellow scaly crystalline powder, and used as a pigment in bronzing and gilding wood and metal work. It was called by the alchemists aurum musivum, or aurum mosaicum. Called also bronze powder. -- Mosaic work. See Mosaic, n.

A stone or thick lump of glass, or kind of pestle, flat at the bottom, used for grinding pigments or drugs, etc., upon a slab of similar material.

my brown, a brown color, nearly intermediate in tint between burnt umber and raw umber. A pigment of this color is prepared from bitumen, etc., obtained from Egyptian tombs. -- Mummy wheat (Bot.), wheat found in the ancient mummy cases of Egypt. No botanist now believes that genuine mummy wheat has been made to germin…

A red-colored respiratory pigment found associated with hemoglobin in the muscle tissue of a large number of animals, both vertebrate and invertebrate.

in the latter by a negative or acid, element or radical. -- Neutral tint, a bluish gray pigment, used in water colors, made by mixing indigo or other blue some warm color. the shades vary greatly. -- Neutral vowel, the vowel element having an obscure and indefinite quality, such as is commonly taken by the vowel in…

of iron or a ferruginous clay, usually red (hematite) or yellow (limonite), -- used as a pigment in making paints, etc. The name is also applied to clays of other colors.