Always read the product packaging and inserts for complete directions, instructions, and warnings, and make sure to perform both the strand test and the patch test before applying your color.
Always wear gloves. Pre-lighten to the desired level before applying toner. In an applicator bottle, mix 1 part of GVP Permanent Liquid Hair Color Toner with 2 parts 20 volume developer. Apply to towel dried hair and process up to 30 minutes. Rinse thoroughly and shampoo.
For additional instructions and Hair Color 101 from Sally Beauty Professionals, click here.