That's pretty tiny.Let me re-phrase - I add 1 drop of Glycerin to every ounce of Pinaud.
I have dryish skin on my face and neck. Neat Clubman ASLs dry my skin out so I add 10% Glycerin to them (that works a treat [for me]).
FORMULA
Clubman ASL/Cologne/whatever 90%
Glycerin 10%
(^ by weight OR volume)