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What says http://lovemakeup.co.uk about these products: "Adjusting your foundation shade could not be easier. Add a drop of Zero Plus or revolutionary zero plus plus to take it darker, zero minus to lighten. Heat adjuster adds warmth to foundations and also doubles up as a flattering blush on darker skin tones. Using the zero minus and zero plus also allows you to contour the face with the use of foundation instead of a contour powder"
I used the white one to make my Mac Fix Fluid in 42 much more lighter because I choose the wrong shade and it`s actually worked well infact I was able to use that foundation even if I`m NC30!!! I think is a great way to correct the wrong foundation. I suggest to not add the entire amount of these product in the bottle but adjust it every single time you put foundation on. I haven`t try the heat yet.