Amazon.com : Global Keratin GK HAIR Professional Hair Creme 20 Volume Developer 33.8 Fl Oz for Hair Coloring Bleach - High-Performance Long Lasting Semi-Permanent Hair Color Toner Dye : Beauty & Personal Care
Color Charm Hair Toner T18 Lightest Ash Blonde, 1.4 oz (2 Pack) + Cream Developer 20 Vol. 3.6 oz - Walmart.com
Can I side a 30 developer in a Wella T18 toner? - Quora
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Wella Color Charm T18 Lightest Ash Blonde 2-Pack with 20 Vol Cream Developer 3.6 oz. - COMBO DEAL - Walmart.com
13 Best Hair Toners for Blonde Hair and How Exactly To Use Them - Ugly Duckling
How to use Wella T18 toner with a 20-volume developer
Can you use a 30 volume developer with toner? I don't recommend it because you'll lighten your hair unevenly