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Frankenberg, Abraham von, 1593-1652; Rebentrost, David, 1614-1703; Keiling, Georg, ca. 17. Jh. · 1718

4. When the substance is thus well impregnated and sufficiently mixed and saturated with the salts, take a good sharp distilled wine vinegar, which is sharpened with common salt, and sprinkle the aforementioned substance with a brush fine and well, like a subtle rain or a gentle dew, entirely thinly. In the sprinkling, however, one must keep rubbing continuously, and this for several hours. Then observe whether any of the substance has vivified itself during the rubbing, like small subtle pearls. These must be diligently taken out with a little bone or wooden spoon, sought after, and diligently held together and collected. The more diligently, longer, and more one rubs (only that if the substance wants to become dry, it must be moistened again with the aforementioned vinegar), the more of our ☿ mercury one can collect. (Note that the substance must always remain fine and fatty during the rubbing, smeary like a fatty Gur mineral earth, and not become hard.) Such collected ☿ mercury, however, one can afterward, as is known, dry through a piece of pure chamois leather and stop it up for the known use, and keep it well in a cool place.
In exactly the manner described above, the ☿ mercury currens running is obtained and brought about from the same nature, by its own salt of the ore, which is called Leo viridis green lion, by means of such Tritur trituration/rubbing and then repeated impragnation impregnation, without the addition of any foreign salt. This is the highest of secrets and has been held most secretly by the philosophers, most useful and necessary for the dry way of the Tincturæ Tincture.