How to identify pure vermilion?

Pure vermilion is made from pure turmeric, water of soda lime powder and a small quantity of pure camphor. Though it is made from turmeric, the odour of turmeric is entirely eliminated and a Divine scent takes its place. The odour of turmeric is evident only when it is sniffed. In contrast the scent of pure vermilion is evident up to a certain distance. Pure vermilion though humid is completely dry. Its touch is ice-cold. Pure vermilion is blood red in colour. It has a high iron content. By application of this vermilion on the forehead, negative energies are prevented from entering through the mid-brow region (bhrumādhya).