Brillantine (brilliantine) was a grease used to groom the hair. It could be crystallized and sold in boxes like the one shown below or liquid form and housed in glass bottles.
"Brillantine" - (1920) rectangular box made up of molded colorless glass pressed for holding the solidifed hair oil, base decorated with draperies, brass lid embossed with baroque décor reminiscent of the eighteenth century. Titled. (Small chips) d: 5 x 8 cm. Photo by drouot.