These are sometimes medicated oils, using olive oil as the basis. More frequently the following Tincture of Soap is used: -
Soft Soap .....
Proof Spirit ....
24 fluid ounces.
Dissolve by means of a gentle heat, and strain.
Tinctures can be mixed with this in the proportion of 1 fluid drachm to 9 fluid drachms, and will form very convenient liniments or embrocations.