Heavy, bright yellow, odorless, tasteless powder. Very slightly soluble in water (1:1,300), and in alcohol.
Action and Uses: Has been used externally in the form of an ointment for application to glandular enlargement and for chronic joint enlargement. Its use is irrational.
Unguentum Plumbi Iodidi (Ung. Plumb. Iod.), Ointment of Lead Iodide, N.F.—Lead iodide (10%), and benzoinated lard.
Plumbi Oxidum (Plumb. Oxid.), Lead Oxide, U.S.P. (Litharge).—PbO.
Heavy yellowish or reddish-yellow, odorless and tasteless powder or minute scales. Almost insoluble in water; insoluble in alcohol.
Action and Uses: Used to make pharmaceutical preparations.
Emplastrum Plumbi (Emp. Plumb.), Lead Plaster, U.S.P. (Diachylon Plaster).—Lead oleate obtained by heating a mixture of lead oxide, olive oil and lard.
Uses: Used in plaster masses and as a basis for diachylon ointment.
Unguentum Diachylon (Ung. Diachyl.), Diachylon Ointment, U.S.P.—Lead plaster (50%), oil of lavender and white petrolatum.
Plumbi Oxidum Rubrum (Plumb. Oxid. Rub.), Red Oxide of Lead, N.F. (Red Lead).—Chiefly Pb3O4.