PRINCIPLES OF COLOR. 
37 
The following colors have after careful experiment been 
found to be unsafe, as being liable to fade or change in 
time, or produce chemical reaction when combined with 
others; their absolute rejection by the artist is therefore 
advised : The chrome-yellows, for which the cadmiums 
should be substituted ; the chrome-greens, which may be 
exactly imitated by mixture of Antwerp blue and light 
cadmium; all the cochineal colors (carmine, crimson-lake, 
purple-lake, and scarlet-lake) ; all the aniline colors, includ- 
ing the pigments known as geranium-red (geranium-lack of 
Schoenfield), rosalack, solferino, magenta, mauve, etc. ; rose- 
car thame (safflorroth) ; yellow lake, Italian pink, brown- 
pink ; pure scarlet (which is completely and very rapidly 
evanescent), guano reel and Prussian blue. Gamboge is 
also of doubtful permanence, but there is no other equally 
pure transparent yellow known. The list of unreliable 
colors is a very large one; therefore, instead of giving it 
in full, the author will merely caution the reader against 
the use of any of those mentioned above, and at the same 
time assure him that by adopting the "palette" recom- 
mended on pages 27-29 he will be able to reproduce 
almost any color that he may have occasion to imitate. 
