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<h4 class="dechead">On One Hand: Adding Toner
Hair developer lightens hair to help achieve a desired color. It also softens the cuticle on hair to allow better penetration of the toner. Hair lightened with a developer without toner can lighten the hair from a few shades to platinum blond, so it is necessary to use caution when applying hair developer without a toner shade.
On the Other: Without Toner
Bright hair colors such as punk dyes or extreme color changes often rely on use of a developer with little or no toner to prepare the hair for vibrant dyes. Some stylists use developer alone on gray or extremely dark hair to help soften the cuticle and allow for better color results from a developer/toner mix in a second step.
Bottom Line
When using developer only, it is essential to use caution or seek a hair stylist's advice, as hair can be damaged by letting developer sit on the hair too long. Hair colors on excessively lightened hair may be more vibrant than intended.
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