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 be advisable to get on the wall, as the same duration of time should be maintained throughout the work between the laying of the colour coat and the following on with the final surface coat—for this reason, if the colour coat sets hard before the final coat is laid, it will not be possible to scrape up the colour to its full strength wherever it may be revealed by incision of the design. When sufficiently set, i.e. in about 24 hours, follow on with the final surface coat, only laying as much as can be cut and cleaned up in a day: when this is sufficiently steady, fix up the cartoon in its registered position: pounce through the pricked outlines: remove the cartoon and cut the design in the surface coat before it sets: then, if your register is correct, you will cut through to different colours according to the design, and in the course of a few days the work should 164