1 After geometric dilution of potent substance, divided into individual dosing units Divided portion powder is places in a small piece of paper (Latin chartula; powder paper) Pharmacist weigh each portion of powder separately before enfolding in a paper 2 non potent drugs, powders are placed on a flat surface such as porcelain or glass plate, pill tile, large sheet of paper, with a large spatula, form rectangular or square block having uniform depth