The following is a recipe for preparing a ointment for nails with natural ingredients (you see also https://www.pilloledistoria.it/4949/storia-contemporanea/smalto-per-unghie-1906).
E’ It is taken from a manual hygiene and beauty 1906, To be beautiful (Sonzogno, Milano), rage at our great grandmothers.
“When the nails are brittle, vitree, ungetele every evening with an ointment prepared in the following manner:
Almond oil gr. 30
Wax white gr. 50
rosin gr. 5
Turns gr. 1
Melt over low heat the white wax and rosin oil; afterwards add alum powder” (Photo gives: grazia.it).