B. Applied to the epidermis in small quantity it colors it yellow. If the application is prolonged, the acid disorganizes the skin, without producing vesicles or serous effusion (Magitot).*

D. Lupus, 10, 1: 298; Purdon, 135, 2: 40.

"Warts, corns, trichophytosis, Purdon, loc. cit.

Condylomata, 43, 324.

Hairy moles, 203.

Chancres and chancroids, 210.

Remarks

The caustic effects of chromic acid are very superficial It does not burn deeply like some of the other acids, but simply destroys a thin layer of tissue with which it is in immediate contact, and hence necessitates frequent application if much depth of tissue is to be destroyed. In some respects its action is the reverse of that of acetic acid (q. v.), and instead of softening and dissolving, it tends to harden the tissues to which it is applied. It may be used in substance or diluted with water.