consisted in a species of engraving in relief both words and designs. The verse was written and the designs and marginal embellishments outlined on the copper with an impervious liquid, probably the ordinary stopping-out varnish of engravers. Then all the white parts or lights, the remainder of the plate that is, were eaten away with aquafortis or other acid, so that the outline of letter and design was left prominent, as in stereotype. From these plates he printed off in any tint, yellow, brown, blue, required to be the prevailing or ground colour in his fac-similes; red he used for the letter-press. The page was then coloured up by hand in imitation of the original drawing, with more or less variety of detail in the local hues.
He ground and mixed his water-colours himself on a piece of statuary marble, after a method of his own, with common carpenter's glue diluted, which he had found out, as the early Italians had done before him, to be a good binder. Joseph, the sacred carpenter, had appeared in vision and revealed that secret to him. The colours he used were few and simple: indigo, cobalt, gamboge, vermilion, Frankfort-black freely, ultramarine rarely, chrome not at all. These he applied with a camel's-hair brush, not with a sable, which he disliked.
He taught Mrs, Blake to take off the impressions with care and delicacy, which such plates signally needed; and also to help in tinting them from his drawings with right artistic feeling; in all which tasks she, to her honour, much delighted. The size of the plates was small, for the sake of economising copper; something under five inches by three. The number of engraved pages in the Songs of Innocence alone was twenty-seven. They were done up in boards by Mrs. Blake's hand, forming a small octavo; so that the poet and his wife did everything in making the book,—writing, designing, printing, engraving,—everything except manufacturing the paper: the very ink, or colour rather, they did make. Never before surely was a man so literally the author
