010r - - - - - Counterfeit jasper
Take horn from which one makes lanterns, quite thin, & underneath make the figure of your jasper, cornalines, & other stones, which will be a work more appropriate than on glass, which is too shiny. And the horn presents a lustre & a fatty polish like jasper.
You know, as with scrapings of the said horn, the roses can be imitated. The horn colors for this jasper wants to have a base with clear turpentine or spike lavender varnish. And colors matte in body are not so appropriate here, however beautiful they are. One needs to oil the unpainted reverse with spike lavender oil.
at top margin
Thin glass, for this effect, is very beautiful.
at left top margin
You can encrust beds with it & on the joints you can throw the filings of talc or of pins on the fresh cement of the said joints. One needs to join them with gum ammoniac mixed in vinegar. To better counterfeit marbled jasper, apply wool of thick hairs dyed in diverse colors & intermingled. After you have laid down all the colors, scrape oblique lines on them, then lay down gold &silver leaf. If you lay down on the horn colors of turpentine, give it a base of silver or of tin leaf. You can also file horn & mix it with strong glue, & lay it down onto the joints of the piece of horn, then even it with a plane.
Stil de grain yellow
It is made in Lyon from the juice of weld & chalk mixed together or better yet with ceruse, which is appropriate for distemper and oil.
Roses
These are counterfeited either with the scrapings of horn used for lanterns, or with scrapings of parchment, very clear, delicate & dyed, employed as you know.
Purple color
Painters make it beautifully by making the first layer of common azur, or better yet azur d’esmail, & next they glaze it with lake, which will be more appropriate for this if you mix in alum, which gives it a violet tint depending on the quantity that you mix in.
Powder for hourglasses
It is made very subtle & not subject to rust &by its weight able to flow. Taking i lb of lead, melt it and skim and purify it from its filth, then pour into it four ℥ of finely pulverized common salt, and take good care that it has no stones nor earth. And immediately after you have poured it, mix continuously very well with an iron tool until the lead and salt are well incorporated, and take it immediately from the fire, stirring continuously. And if it seems too coarse, grind it on the marble and pass it through a fine sieve, then wash it as many as times as necessary until the water becomes clear, throwing out the fine powder that will float on it, renewing the water as many times as necessary until it is all even.