from The Century Dictionary.
- Same as
- noun A compound containing twice as much chromic acid, combined with tho same amount of base, as the normal chromate contains.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Chem.) A salt containing two parts of chromic acid to one of the other ingredients; ; -- called also
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun chemistry
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a salt of the hypothetical dichromic acid
Sorry, no etymologies found.
The addition of alcohol to the bichromate bath — sometimes recommended to harden the film and allow it to stand a higher temperature, and to hasten the desiccation of the tissue — is objectionable, for the spirits tend to reduce the bichromate, which is transformed into the green salt, and, therefore, a partial or complete insolubilization of the gelatine is the result.
Then, too, some other chemical, such as bichromate of potassium, or ammonium chloride, may be used instead of dilute sulphuric acid.
This is carried out by boiling the wool in a solution of the metal, such as bichromate of potash, chrome alum or chrome fluoride when chrome is to be used as a mordant, with alum or sulphate of alumina when alumina is required to be deposited on the fibre, and with copperas when iron is to be the mordant.
In an example, 0.5 gram of nitre was taken, and 59.4 c.c. of the "bichromate" solution were required.
Most of these extracts contain the coloring matter in two states, the developed and the undeveloped, and an oxidizing mordant such as bichromate of potash causes the latter as well as the former to enter completely into combination with a metallic base; whereas many of the other mordants, such as alumina or tin compounds, merely take up the developed portion of the coloring matter together with such small and variable proportions of the undeveloped as might undergo oxidation during the process of dyeing.
Whether Daniel Burnham's jaunty skyscraper is better appreciated when lavished in gum bichromate and platinum is another matter.
I was amazed by two finds: a self-portrait by Edward Steichen, a bichromate gum photograph which appears as a painting - Steichen manipulated the print with brush-strokes to add both white and black shades.
Others have suggested that a mixture of egg white and bichromate produces a photosensitive mixture that works when painted on the linen.
The batteries of bichromate of potassium of the Tissandier brothers had given a speed of four yards a second.
This was the discovery of the 'black reaction' (reazione nera), based on nervous tissue hardening in potassium bichromate and impregnation with silver nitrate.