Purpurissum, si, n. g. Pli. Red painting that harlots vse to colour their faces.
Lewis and Short: Latin dictionary
purpŭrissum, i, n. (masc. collat. form purpŭrissus, Hier. Ep. 54, 7), = porfuri/zon, a kind of dark purple color, used for dyeing red and as a cosmetic, Plin. 35, 6, 12, 30; Plaut. Most. 1, 3, 104; Naev. and Afran. ap. Non. 218, 30 and 31; Hier. Ep. 127, 3.—II.Transf.: quid in oratione meā purpurisso litum,