Toner is a blue, grey or violet tinted dye that removes brassy, gold or orange tones in hair. It can be difficult to find in drugstores, but is available for purchase in beauty supply stores, along with developer and everything else you will need. It is important to select the right shade of toner, so consult with a hairstylist or color professional before purchasing. Toner can also be applied halfway between hair coloring appointments to keep your color looking fresh.

In a two-step hair coloring process, the first step is to lighten the hair to the desired level and the second step is to tone. Dark hair colors often contain more orange or auburn undertones than lighter hair. When lightening or highlighting dark hair, the pigment is removed from the hair strand, leaving the orange undertone, which can cause the new blonde color to appear very brassy. Apply a toner after lightening to cancel out the brassy tones in the hair.

Start with dry hair.

Secure a towel around the neck and shoulders to protect clothing.

Apply a thin layer of Vaseline to the skin all the way around the hairline. This will prevent any color from staining the skin.

Mix equal parts toner and 10-Volume Developer in a small mixing bowl.

Use an applicator brush to apply toner to the hair in approximately 2-inch sections from the roots to the ends.

Secure loose hair to head with a large hair clip.

Let toner sit for 15 minutes. Check hair every 5 minutes to ensure the proper color is achieved. Some hair may require additional time.

Rinse thoroughly with warm water. Be sure all product is removed.

Apply a conditioning mask to hair and leave on for 10 minutes.

Rinse thoroughly in lukewarm water.

To keep your blonde hair looking fresh between colorings, use a purple shampoo once a week. The violet tones in the shampoo will prevent any brassiness from recurring. Follow up with a deep conditioner to keep hair looking healthy and smooth.