Making and Knowing
A minimal edition of BnF Ms Fr 640 in English Translation

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Perfect amalgam

Take the finest sandstone you can find and make a cavity in the middle. And put in it an eighth part of and rub it and wear it down while adding some water with or until the material becomes paste—like and even harder. Then, if you want, corrode it with good aqua fortis, if it is or . Then melt it again, having taken it out as you know. The will have some color, and after being melted it will leave some flecks of , and the will be very fine and will have almost no covering.