How-To: Lift & Deposit Level 4 Hair To Bright Yellow Yes, you read that title right! If you've ever wanted to get your clients the bold fashion colors they desire in less than an hour, we've got you! GKhair Italian Artistic Director Federico Longo (@federico_longo_modaartecapelli) demonstrates how he takes a Level 4 brunette to bright yellow in 30 minutes with his innovative Bamboo Color Technique. Don't believe us? Scroll down to watch the how-to and grab the formula below! [btc-products] Here's The Formula! GKhair Juvexin Lightening Cream + GKhair Juvexin Cream Color Yellow + 40-volume developer ...