
Originally Posted by
Kirsty@Rouge
Face Atelier has some adjusting formulas in their Ultra Foundation Pro foundations called "Zero Minus" t lighten foundations and then 2 to darken foundations called "Zero Plus" and Zero Plus Plus". You just add a drop or 2 to your foundation if it isnt dark enough and the formula darkens it depending on how much you add.
I haven't tried it but I have seem people work with it and who love it! I think there might be one or two other brands that have a similar product too.