Well yes and no lol. We all know the standard chart of undertones such as 6 is orange 8 is yellow but this is really designed to be as universal and standard as possible. In reality everyone has diffent amounts of pigments in their hair, so if you are seeing lots of orange in the hair, the undertone will still be orange when you are lifting with colour.
Basically the extra warmth is coming from the pheomelanin pigment in the hair, which ranges from yellow-orange. Normal hair colour can only lift out the brown eumelanin, but prelighteners are stong enough to also lift the pheomelanin.
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