067r - - - - - [continued]
light, pull out the hairs which make the tip too long with the ends of your fingernails, and this until the tip seems good to you, & and until you notice in it the rat hairs which are entirely black & the hair of the petit—gris is at the whitish from the root to the middle. When it pleases you, bind b and tighten it very well with a thread in two places, then cut the excess & fit it in a quill of a convenient size for it, of a duck or a crow for the small ones. Good pinceaulx are those that, once soaked in water, do not bulge when you trace on your hand.
Oil
All oil which is imbibed by paper & once heated by fire evaporates & leaves the paper clean, like turpentine & spike lavender oil, is good for making varnish.
Sand
Everything ground & tempered becomes porous, according to some.
Bellows furnace
Before you put in the metal, it is necessary that it be red at the bottom, like like a charcoal & well inflamed. Next, you fill it & cover the charcoal & adjust the bellows, otherwise the metal on top would melt as a result of the bellows & its bottom would be curdled & cooled & would not run. But if you proceed in this manner you will melt everything you like.
Varnish on paper
The Germans make boxes p covered with painted paper & varnish it with glair of the egg mixed with gum & a little oil, not of spike lavender, but another odorant that resembles olive oil. Every work done with glair supports oil. It is with this that painters trick the poor peasants, painting their bands of taffeta with this glair, to be done sooner. But the first rain carries away everything.