“We use toners to enhance dull tones or cancel unwanted tones,” says hairstylist Natasha Speth. “When we are canceling unwanted tones, we refer to our faithful color wheel to select the proper tones. We would use complementary colors to cancel out unwanted tones.” The basics of at-home toning are using violet for yellow, green for red, or blue for orange. “For instance, if a light blonde with soft golden undertones would prefer to be an icy white blonde, we may use a violet base toner or send them home with a violet-based shampoo and conditioner.” Purple Reign, Together Beauty ($24) Purple Shampoo, Function of Beauty (starting at $24) Violet Brightening Shampoo, Playa Beauty ($28) Blonde Moment Purple Shampoo, Not Your Mother’s ($7.79) Cool Blonde Shampoo, dpHue ($26) Blonde Revival Purple Toning Shampoo, Aveda ($30) Blonde Angel Wash, Kevin Murphy ($31) Tone It Down Solid Shampoo Bar, Ethnique ($22.99) Purple Shampoo, artnaturals ($7.69) Purple Shampoo, Kristin Ess ($24) Blonde Perfecting Purple Shampoo, Morroccanoil ($24)