Take a good quantity of seruse, and being grosly braised put it into a fine earthen bason or great china dish then put it to a good quantity of running water wherein wash the ceruse till it be thoroughly mixed with water Then let it settle 2 or 3 hours Which done, tast the water and you shall find it tast harsh and unpleasant. Observe well the tast and poure the water off and cast it away. you shall find this water to carry away with it a deale of grease rising on the top. Then add to as much more water, and then stirre the ceruse as before and tasting it poure off the cleare water reserving the bottome. This work you must reiterate some dozen times or more till by continuall washing you find your water hath washt away all the salt out of the ceruse and when you perceive that the water taste fresh as other water, then let it dry or setting the bason upon a soft fire, let the residue of the water vaporise, and the ceruse being drie use of the fairest and reserve for yr use.,Probatissimum