Means "precious water" invented in 1890 by Monsieur Depensier
This toner is used to refine skin texture as it eliminates blackheads, tightens pores and gently exfoliates dead cells.
Eau Precieuse has a similar action to P 50 from Biologique Recherche
It is also ideal for acneic skin thanks to the synergic action of salicylic acid ( reduces oil) , tannic acid (antibacterial & tightens pores) and Boric acid (antibacterial). It reduces sebum secretion and pimples