What a godsend this is for severely yellow toned gals such as myself!!! (Just to give you an idea, Mac C3 in Studiofix is not yellow enough). It is a vibrant yellow liquid, neither runny nor too thick, similar in consistency to normal liquid foundations, but more translucent. Mix this with any liquid foundation to boost the yellow factor--and you don't need to use much! I'm sooo doing the happy dance, since I can't wear a zillion foundations because they are all too neutral or pink for me. I mean seriously, besides Becca, Mac, Awake, Dior, KA, Armani and a few others, most brands (Clinique, EL, LM, Smashbox, etc, etc, etc--even Bobbi Brown! ) do not carry colors that I can really wear. Which SUCKS! But thanks to this little miracle, I might be able to finally try some of them out. Major thanks to Alexis for introducing me to this!