118r - - - - - Snails
Those which are found in the sea and similarly those in which certain small crabs dwell are very beautiful for grottoes, if they are stripped of the first crust of their shell with aqua fortis, for they truly appear to be made of mother—of—pearl.
For removing flaws and flashing from things molded in a core mold
If your molds are made of good plaster which withstands fire, they will not crack, especially if they are squeezed well between two tables with presses or in a pot filled with ashes or sand, and, therefore, they will not develop flaws. If they they develop some flaws, you can remove them with a burin called chaple which has a tip like a small chisel.
For grottoes
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The old vine stocks
Stones made from water called tuf; charcoal; the compound of tin & fine latten; paper pestled & mixed with pestled glass; cork; heated parchment; white coral are appropriate for making grottoes. But fantastical pieces of wood which are found in the forests & mushrooms and potirons of trees, once dry, are better than all because they are light. One mixes in small pieces of looking—glass tin which has a shiny luster. One finely pestles in a different kind of marcasite which one washes to cleanse them of earth, &one dusts the work with it, which is very beautiful. If there is no fountain in the grotto, one glues all al of this with colle forte, which and it is soon done. Take examples of all kinds of mines. The sulfurous marcasites which do not have a grain but are even like looking—glass tin are very beautiful.
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Rosette is found sometimes mixed with certain brittle lumps which are pulverized under the hammer, which are very beautiful pulverized on grottoes.
Looking—glass tin
It whitens and renders firm fine tin if en on one puts in in one ounce of it, that is to say, i ℥ of looking—glass tin in one lb of fine tin.
Sal ammoniac
ItSal ammoniac water is very right for casting in gold and in silver.