Page:The Art of Bookbinding, Zaehnsdorf, 1890.djvu/138

108 Or the whole of a cover may be blacked with tartar and copperas, then with a diluted solution of acid it may be sprinkled, this will give grey-white spots on black or slate ground: if, after washing, the cover be sponged over with some colouring liquid, such as analine dyes, the spots will be of the colour used.

I do not give many methods or receipts for producing colours for calf, because, as before stated, the introduction of fancy calf has rendered obsolete the old-fashioned way of boiling and preparing the different woods for making colours, and the above will be found useful for colouring calf in many different ways.