The addition of 1% "CAB-O-SIL" to a nonthixotropic mineral oil has increased the viscosity from 410 centipoises (Brookfield viscosity) to 8,000 centipoises at 2 r.p.m. and 3,500 centipoises at 2 r.p.m. "CAB-O-SIL" can be used effectively in salves and ointments where other pigments are present.