Caroline Kim (@carolinekimhair), an artist at Salon Nesou in Santa Monica, CA, shares the details for this bright blonde to smokey blue transformation:

STEP 1: Prelighten the hair from mid shaft to ends using Wella Color Charm powder lightener and activating lotion.

STEP 2: Lighten the root area using Color Charm powder lightener and 20 volume developer.

STEP 3: Tone with Wella Color Tango 10C + 1" of the IC (intense cool) additive and activating lotion.
 

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