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Getting the right color is only half the battle.

Speaking withRefinery29, Cunningham said she uses theOlaplex No.

Emma Stone with red hair posing for a picture

3 Hair Perfectoras a pre-shower treatment, followed by theOlaplex No.

4 Bond Maintenance Shampooand theOlaplex No.

5 Bond Maintenance Conditioner.

Side view of Emma Stone’s auburn hair

Now, who’s ready to book a salon appointment?