flambe and then quenche it with white vinaigre very strong, and take it of, & if you see that it hath not loste nor changed the colour, it is of the best, and if it take colour againe it is of the finest and moste parfite. And if a manne could get of this seconde, which encreaseth his colour, he might sell it for three or foure crounes the vnce, but very little of it is to be had that wil kepe his natural colour, but will change some thing in the triyng. And you must note, that in making these tri∣als with fire, if the stone do not keepe wholly his na∣turall b••ate, the azure shall not be of the fairest, but of the meane sort. To know whan it is pouder, whether it be good or no, take a Goldsmithes melting pot, and put a little of it, into the said pot at your discretiō, and set it on the fire and let it flame & heate, and then let it coole againe. And if it bee not good it will melte like glasse, but if it be good it wil remaine vnmoltē in his owne substance and essence, & although it bee in pou∣der, it will yet be good, and if incace it were but halfe good, and halfe badde, the badde will melte, and be∣come like a cake, and the stone will remaine in his state and colour still. And this fraude and deceit is co∣monly wrought of them that sell it, and therfore lette euery manne beware of it. And of all the three sortes of Azure, you shall get out for euery pound of stone, I meane of that which endureth ye cimentes aboue said, about a fiue vnces and a halfe of Azure, and the firste which shalbe the finest will be solde for xij. or xiij. du∣••ates an vnce, the second for iij. or iiij. crownes, and the third a crowne. Than shall you take out the laste whiche is called cinders whiche is of no great value, & yet neuertheles it wil beare the cost & charge of your past, and by this meanes you maie giue iudgement of the gaine and profits of your worke. But if it were of those stones whiche in triyng of them do decrease and lose their colour, a manne can not make so muche no•• so fine: but if you will take paine for to fine theim the