40 
"Terra Siennas, umber and Coulognes earth are cheaper. 
Sepiae, the cuttle fish brown, commonly so called, is a sort of 
neutral, as all browns are, being chiefly used for shades, 
but should vary with the subject to be represented. 
Those that may be used in oil may generally be used for printing 
in colours, &c. 
As perfect black is rather a desideratum in printing, I might ad- 
vise transparent red or blue, which may be added to lamp or Franck- 
fort black, to take from their dull opacity, — the red to the lamp black, 
commonly called blue black ; and the blue to the other when too 
brown. A discreet printer will know by a trifling hint what to do. 
Painters of experience do not generally want the finest colours for 
their works, as they can give a natural and fine effect by properly 
contrasting them in chiar' oscuro, &c. : and it is not the best paint or 
best tools that make the best artists : yet some hint may be of use 
to judicious hands. No merit is of consequence without competent 
judges. 
I have used ordinary colours all through the present work, because 
it will ehow the more general extent of common colours. The best 
preparations might have seemed to have given a fuller effect, but 
would perhaps mislead, as too much might have been attributed to 
their gaiety, and not to their order : my list is therefore only as 
follows. 
Gamboge 
Carmine 
Prussian blue : 
a few others as occasional auxiliaries may now and then be useful for 
cheapness in back grounds, drapery, &c. 
Among minerals, the three substances which approach nearest to 
the colours of the three primitives are: 
Yellow, orpiment, or sulpluiret of arsenic. 
Red, realgar, or red sulj)liuret ofai-senic. 
Blue, lapis lazuli. 
Among vegetables, the petals of ranunculus, and the lemon peel- 
