[12] Real ultramarine is sold at £8 per ounce. The best imitation, or German ultramarine, is procurable at any oil-shop at about 3s. to 4s. per pound. The best carmine should be procurable at 6s. per ounce, but artists' colourmen often charge £1 1s., owing to the small demand for this pigment. The best chrome yellow (chrome yellow is kept in many shades) is about 1s. 6d. per pound.
If the student will try carefully to realise these colours, and will fill up the circles in our diagrams with them, he will thereby be much assisted in his studies; but it will be still better if he prepare fresh diagrams on a larger scale, and use squares instead of circles. I should recommend, and that I do strongly, that the student work out all the diagrams which I have suggested on a tolerably large scale, using the colours where I have used words. I should also advise him to do an ornament, say in red on a gold ground, and outline this red ornament with a deeper red; to do a gold ornament on a coloured ground, and outline it with black; and indeed to carefully work out an ornamental illustration of our propositions, Nos. 24, 25, 26, and 27, and to keep these before him till he is so impressed by them as to _feel_ the principle which they set forth. This should be done on a large scale in all our designing-rooms and art-workshops.
As we shall have to refer to colours by naming pigments, and as I am constantly asked what pigments I employ, I shall enumerate the paints in my colour-box; but I shall place a dagger against those which I have in my private box, and which I do not supply in my offices; but these I seldom use. Of yellows I have [14]king's yellow (not a permanent colour), [14]very pale chrome, lemon-chrome (about the colour of a ripe lemon), middle-chrome (half-way between the lemon and orange-chrome), orange-chrome (about the colour of the rind of a ripe orange), [14]yellow-lake, [14]Indian yellow. Of reds--vermilion, carmine, crimson-lake. Of blues--[14]cobalt, German ultramarine, both deep and pale, Antwerp blue, indigo. Of greens--emerald, green-lake, pale and deep. Of browns--raw Turkey umber, vandyke, Venetian red, purple-brown, brown-lake. Besides these I have what is called celestial blue, which is a very pure and intense turquoise, vegetable black, flake white, and gold bronze.[13]