thus tempered, the water being distilled, may go off in vapour and the wax may remain; you will thus make good crayons; but you must know that the colours must be ground with a hot stone.
613.
Chalk dissolves in wine and in vinegar or in aqua fortis and can be recombined with gum.
614.
PAPER FOR DRAWING UPON IN BLACK BY THE AID OF YOUR SPITTLE.
Take powdered gall nuts and vitriol, powder them and spread them on paper like a varnish, then write on it with a pen wetted with spittle and it will turn as black as ink.
615.
If you want to make foreshortened letters stretch the paper in a drawing frame and then draw your letters and cut them out, and make the sunbeams pass through the holes on to another stretched paper, and then fill up the angles that are wanting.
616.
This paper should be painted over