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Yup! Not all cannabis strains can go purple. But Indicas tend to more often, and Kushes are mostly indica so that is how that works.

I am growing a strain called Vale Tudo Rd 1:

https://en.seedfinder.eu/strain-info/Vale_Tudo_Round_One/Copa_Genetics/

It has Kimbo Kush and Mendo Purples as its parents, so a good chance it will go purple if I can get the tent cold enough.