Gosh, I really wish this stuff was still around. It was designed
for use to mix with the Agnes B. brand 'Light Reflective Foundation', however I used it with any of my liquid foundations and it worked out great. The idea was to "adjust" the color of your foundation by adding 1-2 pumps of the Makeup Mixer and if necessary, keep adding 1 more pump at a time until you achieve the desired shade. It is/was an excellent idea though, and was sad when they discontinued it.