from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Any of various blue dyes, used to sensitize photographic emulsions to a greater range of light.
from The Century Dictionary.
- noun In chem., a beautiful blue dye, chinoline blue, prepared by acting on a mixture of chinoline and lepidine with amyl iodide. Unfortunately it does not resist the action of light, and hence has lost its importance as a dyestuff, but, it is used in making orthochromatic plates for photography.
- noun The blue coloring matter of certain flowers, as the corn-flower, violet, and species of iris.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Chem.) One of a series of artificial blue or red dyes obtained from quinoline and lepidine and used in calico printing.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Any of a family of
synthetic blue dyesused in photographyetc.
Sorry, no etymologies found.
Among the semi-stable, must be classed cyanine or Leitch's blue, smalt, and Prussian blue.
However that may be, in these days both names signify cobalt compounds, coeruleum being a stannate of cobalt, and cyanine a mixture of cobalt and Prussian blue.
Unlike the former, cyanine, being composed of two old colours, can lay no claim to originality.
Sulphon cyanine works well with other dye-stuffs, and gives shades which are fast to milling.
Whether these remarks are applicable to cyanine or not is a question for artists to decide: in our opinion, with so many semi-stable original pigments, the introduction of semi-stable compounds is to be deprecated.
Within the last few years, a compound similar to cyanine has appeared, under the name of _Leitch's Blue_.
Hence the peculiar properties of cyanine remain unchanged only so long as the Prussian blue itself, the pigment losing its colour by degrees on exposure to air and light, and gradually assuming the tint of the paler but more permanent cobalt.
Another class of bodies also concerns our subject: the special sensitisers used by the photographer to modify the spectral distribution of sensibility of the haloid salts, _e. g._ eosine, fuchsine, cyanine.
_ -- The blue coloring matter of flowers we propose to call cyanine.
Xanthine, in combination with cyanine, modified by the various juices of plants, communicates in variable proportions orange-yellow, scarlet-red, and red colors to flowers.