If you wish to make a different azure, take a jar made of the purest copper, and fill the pot half full of quicklime, and then fill it up to the top with strong vinegar. And so cover it and seal it, and put some sticky clay or paste around the mouth of the jar, so that no moisture can escape, and put it in a warm place, either underground or in the manure which is thrown out of the stable, and leave it there for the period of one month. Then open the pot, and put what you find in it in the sun to dry. This azure is not so good as the other; nevertheless it will do for woodwork and walls.