Dictionarium polygraphicum, or, The whole body of arts regularly digested ..: illustrated with fifty-six copper plates . our ; and for this reafon the ladies have left ofF wearing it. De Boot endeavours to account for all thefe efFedts from na-tural, and even probable caufes. The way to make TuRcoiSE. Take ten ounces of naturalcryffal prepared, and faturnus glorificatus j half an ounce of pu-rified verdigreafe, and one ounce of our prepared zafFer, thewhole in fine powder; which mix well together in a crucible co-vered, with another well luted and dried, which afterwards putinto a glafs-houfe
Dictionarium polygraphicum, or, The whole body of arts regularly digested ..: illustrated with fifty-six copper plates . our ; and for this reafon the ladies have left ofF wearing it. De Boot endeavours to account for all thefe efFedts from na-tural, and even probable caufes. The way to make TuRcoiSE. Take ten ounces of naturalcryffal prepared, and faturnus glorificatus j half an ounce of pu-rified verdigreafe, and one ounce of our prepared zafFer, thewhole in fine powder; which mix well together in a crucible co-vered, with another well luted and dried, which afterwards putinto a glafs-houfe furnace, where leave it for three hours; thentwelve hours in the annealing furnace, that it may cool gently ;then takeout your crucible, and break it, and take out the mat-ter, and cut and polifh it, and you will have Turcoife-colouredHones like thofe of the old rock. The way of making TuRCOiSE bhe^ a particular colour in thisart. For this colour take a pot full of cryftal frit tinged viith anaqua-marine colour, or blue, whereof we have given feveral piepa* \f diiitli s i jr 1- ><t lis Qfn. e, le hr; ^^S. f U R 337 pi-cparations, which colour mud be fair and full, for all dependsoh that; it being well melted, put into it, little by little, fea faitdtxrepitated white, and reduced to powder, mixing it well anifoftly, as we have noted in fpeaking of other metalline colours ;and the blue, from clear and tranfparent, will become thick jfor the fait, penetrating the glafs, takes away its tranfparency,and caufes a palenefs ; hence alone comes the Turcoife colourufed in glafs. When the colour is right to the workmans fan-cy, it muft be prefentiy wrought, for the fait will evaporate, andmake the glafs tranfparent and difagreeable ; if in working thismetal the colour fades or goes off, you muft add a little rriore ofthe fame decrepitated fait, as before, and the colour will return. We will here advertife the workman, that he muft take care,that this fait be well decrepitated,
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