Sorry to go off topic here,but I just got to Chapter 37 in Legendary Siblings ( and there is a reference to pao fa yau, some kind of hair tonic that the women are wearing.

This is the same pao fa yau that Lao Dat Sang, the "founder" of Pao Fa Lien Wing Chun Kuen, used to make in his day job ( It is a tonic made up of some kind of wood shavings (pao fa).