from this book... http://books.google.com/books?id=fS9...ophyll&f=false
In 1879 Mr. F.E. Ives suggested the use of chlorophyll of blue myrtle or periwinkle leaves for making collodio-bromide plates colour-sensitive. The chlorophyll is prepared by steeping the leaves, when cut into small pieces, in pure alcohol and heating for a few minutes. The solution of chlorophyll is in its best state when fresh, but will keep for some weeks in a cool place, if not exposed to light. To prepare the plates, flow with collodio-bromide emulsion, and when set cover for a few seconds with the chlorophyll solution, after which wash in distilled water until smooth. The plates must be used with the yellow screen, which Mr. Ives prapres by making a tank with plate-glass sides which is filled with a solution of potassium bichromate [modern equivalent; use a yellow filter]; the strength of the yellow solution may be increased or diminshed according to the subject to be copied. Excellent results have been obtained by this method.
Many kinds of colouring matter have been used for making plates colour-sensitive, amongs them eosine, erythrosine, cyanine, fuchsin, azaline, aurantia, rose Bengal, quinoline red, chlorohpyll, xanthophyll, gallocyanic (a blue dye), chrysanaline, corallin, aldehyde green. Most of these are derived from coal-tar distillation.
Chlorophyll; perhaps you could make this yourself Umut if you find the right plant.
Also, found here... http://books.google.com/books?id=O3k...ophyll&f=false
F.E. Ives, colour-sensitive plates. A compound sensibilisator of fresh blue myrtle chlorophyll with a little eosin is found to be the most sensitive to yellow and green.
from Wikipedia - Vinca minor: Vinca minor, Lesser periwinkle and Dwarf periwinkle, is a plant native to central and southern Europe, from Portugal and France north to the Netherlands and the Baltic States, and east to the Caucasus, and also in southwestern Asia in Turkey.
Last edited by holmburgers; 10-27-2010 at 01:52 PM. Click to view previous post history.