from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of various salts containing the negative trivalent radical Fe(CN)6 and used in making blue pigments.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. any of various salts containing the trivalent anion Fe(CN)63-; used in making blue pigments
- n. a complex ion in which a central ferric iron atom is surrounded by six cyanide ions
from the GNU version of the Collaborative International Dictionary of English
- n. One of a complex series of double cyanides of ferric iron and some other base.
from The Century Dictionary and Cyclopedia
- n. Acompound of a base or basic radical with ferricyanogen.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. salt of ferricyanic acid obtained by oxidation of a ferrocyanide
Sorry, no etymologies found.
Irradiation of melanin for 20 min increased the velocity of the NADH/ferricyanide coupled reaction 3-fold in comparison to that measured for non-irradiated melanin, while 40 min irradiation had an even larger effect, causing a 4-fold increase in velocity (Table 1).
The excitement of exposing and watching a print develop and then working on the print with ferricyanide after the fix kept my eyes occupied.
While similar actions today are considered unethical, it was common practice in newspaper and magazine darkrooms to have potassium ferricyanide next to spotting pigment bottles.
He was also known to print images down to black and use potassium ferricyanide or bleach to reveal only the areas he wished to show.
Expose until the image is visible, then develop by floating on a solution of potassium ferricyanide at 5 per 100 of water — the image appears at once with a rich brown color.
As good a formula as any is: Potass ferricyanide, 300 grains; potass bromide, 100 grains, water 20 ounces; Ammonium bromide may be used in place of the potassium salt in the above formula; the difference is not marked, but the ammonium compound tends to give a somewhat warmer brown or sepia.
If, however, only a portion of the print needs reduction, this can be effected by applying the ferricyanide solution locally with a brush or bit of absorbent cotton.
A very dense negative, for instance, may be reduced either with the ferricyanide of potash or persulphate of ammonia reducer; and a thin negative with proper graduations can frequently be intensified to advantage in the print.
Without encouraging the reader to be careless let it be said that "any old formula" (of ferricyanide and bromide) for the bleacher will prove successful.
If not washed long enough, the yellow of the ferricyanide will remain in the print, robbing its gradations of brightness and purity of color and impairing the permanency of the print.