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A salt of chromic acid.

alt containing two parts of chromic acid to one of the other ingredients; as, potassium bichromate; -- called also dichromate.

acid containing two equivalents of the acid radical to one of the base; -- called also bichromate.

A salt of a polychromic acid.

r component, or that such constituent is present in double the ordinary proportion; as, bichromate, bisulphide. Be- and di- are often used interchangeably.

To combine or treat with a bichromate, esp. with bichromate of potassium; as, bichromatized gelatine.

A colored photographic picture taken upon paper made sensitive with potassium bichromate or some other salt of chromium.

Prussian blue. -- Chrome red, a beautiful red pigment originally prepared from the basic chromate of lead, but now made from red oxide of lead. -- Chrome yellow, a brilliant yellow pigment, PbCrO4, used by painters.

sible with difficulty. Its chief commercial importance is for its compounds, as potassium chromate, lead chromate, etc., which are brilliantly colored and are used dyeing and calico printing. Called also chrome.

s of making such prints. According to one method, the film is sensitized with potassium dichromate and exposed to light under a reversed negative. After the dichromate has been washed out, the film is soaked in glycerin and water. As this treatment causes swelling in those parts of the film which have been acted on by…

Lead chromate occuring in crystals of a bright hyacinth red color; -- called also red lead ore.

ic acid diluted with three gallons of water, with a solution of six pounds of potassium bichromate in two gallons of boiling water. It should be used cold.

H2FeO4, which is not known in the free state, but forms definite salts, analogous to the chromates and sulphates. -- Ferric oxide (Chem.), sesquioxide of iron, Fe2O3; hematite. See Hematite.

A mineral of a red, or brownish or yellowish red color. It is a chromate of lead; -- called also phoenicocroite.

Chromate of copper and lead, of various shades of green.