Hair neutralizer is your best ally when it comes to achieving the trendy cool-toned hair colors your clients are after! In this article, we take a look at hair neutralizer products to neutralize warm tones in hair and the questions your clients may have about maintaining their neutralized hair. 

How does hair become brassy?

Before explaining to clients how hair neutralizer works, you may find it useful to break down the basics of brassiness for them. While there are plenty of reasons hair can reveal excessive warmth, the two most frequent are:

  • Chemical processes: The hair has been chemically lifted without removing all of the underlying pigments. Or, the client has applied cool color over a warm base and the warm tones are peaking through because blue pigments tend to break down in hair faster than red and orange ones do.
  • Natural processes: Exposure to sunlight, using certain haircare or styling products, and even heat styling can reveal unwanted warmth in natural or colored hair. 

Hair neutralizer products: how to neutralize hair color in salon with toner

Toning is a hair color neutralizer service that gives you full control over your client’s hair color. A tone-on-tone product such as Dia Light by L’Oréal Professionnel Paris helps to neutralize warm tones in hair and unify color from root to tip with zero lift for a professional finished look. While your clients may worry that toner will alter the overall appearance of their hair color, it’s important to communicate that Dia Light deposits transparent tone only!



Thanks to its acidic technology, Dia Light returns hair to an acidity that’s very similar to the capillary fiber’s natural pH, making it efficient at neutralizing hair color as well as protecting the hair’s condition. More pigmented than hair neutralizer shampoos, toning services are recommended in between regular coloration services to help prevent brassiness, refresh your client’s color, and increase its longevity in between services. 

The three most important “rules” are:

  •  Violet cancels out yellow undertones.
  •  Blue cancels out orange undertones.
  •  Green cancels out red undertones.

Of course, telling your client that you’re applying a green tone to their hair is a recipe for panic! Instead, it’s best to refer to purple tones as “iridescent”, blue tones as “ash”, and green tones as “matte”. 

High neutralization on dark hair: matte tones

When it comes to neutralizing dark hair from levels 1-4 (black to brown), we know that these shades tend to have naturally red undertones so we’d utilize green or matte (.7) tones to neutralize them. Popular neutralized dark brown hair shades include ashy brunette, mocha, walnut, and even red velvet. 

High neutralization on medium hair: ash tones

Mid-tone hair colors from levels 5-7 (light brown, dark blonde, and blonde) naturally have orange undertones that can be neutralized using ash (.1) tones. If your client is looking for inspiration for a fresh new medium hair shade, look no further than ashy blonde, cool beige, terracotta brown, or ginger! 

High neutralization on light hair: iridescent tones

The lightest shades of hair from levels 8-10 have yellow undertones (which can also sometimes lean orange). To neutralize them we’d use iridescent (.2) tones for on-trend neutralized hair colors such as vanilla, light gold, buttercream, and even various shades of grey and silver.