^^^^^^H^^^l 



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- 

 carthame (safflorroth) ; yellow lake, Italian pink, brown- 

 pink ; pure scarlet (which is completely and very rapidly 

 evanescent), guano real 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. 



