[Divers traitez de la philosophie naturelle]

netrates the body, it colors it with an invariable color; for when one flees and the other flees, one takes the other, and they flee no more, because nature has taken its equal; like its enemy, and they make themselves intertwined. Here is how you will do it, and the regimen is such: Steep it in child's urine, and in sea water, and in clear permanent waters, before it is dyed, and cook it over a small fire, until the blackness appears: for then it is certain that the body is dissolved and rotted: and then cook it with its humor, until it wears a red robe, and always cook more, until you see there the serpentine color that you ask for.

9. SICTUS says, Know