Your Official Guide to Barbie Blonde

6 Must-Know Tips For Turning Your Clients Barbie Blonde Hello, Barbie—let's go party? More like: Hello, Barbie—let's go blonde. Greta Gertwig's "Barbie" starring Margot Robbie is hitting theaters in T-minus two months, which means there's plenty of time for clients to go blonde before the world's most iconic doll takes the stage.   To help you out with all your blonde requests, we complied a list of must-know tips, formulas and more to make sure it all runs smoothly.   1. Going warm? Your lift should look like a banana peel. PSA: Per BTC's Trend Report, clients are going...