from The American Heritage® Dictionary of the English Language, 5th Edition.
- adjective Of, relating to, or accurately reproducing the colors of the subject.
- adjective Sensitive to all colors except red.
from The Century Dictionary.
- In photography, correct in the relations or in the rendering of colors — that is, free from the usual photographic fault of exaggerating the deepness of greens, yellows, and reds and the brightness of blues and violets.
- Staining in the exact shade of color of the dye used.
- noun An orthochromatic plate; a photographic plate the sensitiveness of which is so distributed throughout the spectrum as to give in the image a normal gradation of light and shade.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective Being
uniformly sensitiveacross the entire visible range, and thus reproducing coloursfaithfully
- adjective photography Sensitive to all colours except
from Wiktionary, Creative Commons Attribution/Share-Alike License
Upon plates rendered "orthochromatic" by staining with alizarine, or other dye-stuffs, the whole visible spectrum can now be photographed; but those with their maximum of sensitiveness near G are found preferable, except where the results of light-analysis are sought to be completely recorded.
Her retinas expanded and her eyes looked normal to the orthochromatic film.
Even on orthochromatic stock, the warmth of it survived in black and white, though the film was never released, of course.
The exposure through the yellow screen with an erythrosine plate is about the same as if you had no orthochromatic plate -- a plain plate instead -- provided you are not using too dark a yellow on your screen.
One of the best orthochromatic effects made through this tank is with
There was no retouching of any kind, and I think the print shows the value of using a color filter with an orthochromatic plate where colors are contrasted in the subject.
Experiments will also be tried with orthochromatic plates and the use of
I will give to a common plate about four seconds, an orthochromatic plate under the same conditions five seconds.
But in portraiture, as well as in landscape photography, recourse must also be had to orthochromatic plates to obtain effective pictures, particularly as plates can now be produced in which the relative sensitiveness closely resembles that of the ordinary emulsion plate.
There are many ways of producing an orthochromatic effect; one is the use of a glass tank placed behind or in front of the lens, in which a coloring matter from either a vegetable or mineral product is placed; this tank or cell is, however, only for use in the studio, as for outdoor photography we have a colored glass screen, so as not to be bothered with carrying colored solution.