Note 23 — Chapter VIII

(p. 59.) If you can, buy your ink of a plate-printer or of a lithographer. That used by book-printers will not do! The trouble is that the ink used by ordinary plate-printers is of a disagreeably cold cast, as it is mixed with blue. Etchings ought to be printed with a warm black, and sometimes, especially in the case of somewhat over-bitten plates, with an ink of a decidedly brownish hue. Inks are made of linseed-oil varnish (i. e. linseed oil that has been boiled down or burned), and the blacks mentioned in the text. There are various qualities of varnish according to its consistency, varying from thin through medium to stiff. If you wish to mix your own ink, you must try to procure the materials of some plate-printer or lithographer. For varnish use the medium, for black the Francfort. The burnt Sienna (which you can buy at any paint-shop) is used only to warm up the black. Lay some of the dry color on your ink-slab, add a very little of the varnish, and mix with the muller. Then add more varnish until the ink forms a tolerably stiff paste. The grinding must be carefully done, so as to avoid grittiness. Besides, if the color is not thoroughly well incorporated with the varnish, the ink will not stand. To preserve the ink for future use, put it into some vessel with a cover, and pour water over it. The water standing on top of the ink keeps it soft. Otherwise the varnish would harden.