What is the difference between a Single Process color and a Double Process color?

A Single Process color is the most common.  One formula is mixed and applied to the re-growth on the scalp to create a new base color.  The natural color is lifted and a new color deposited in one easy step. That new base color can now be kept as is or highlighted to create a more dimensional result.
A Single Process color is for those who want to…
– Deposit color (make their hair darker)
– Lift their natural color only 3 levels.
– Cover grey

When the desired base color is more than 3 levels lighter than the natural color, a Double Process is necessary.  The first part of the process is to use a scalp bleach to lift the base color past the orange/bright yellow stage.  After, a color is mixed and applied to the pre-lightened hair to reach the desired tone with minimal to no warmth.

Here are some examples of colors that were most likely achieved by using a double process…