I’m a hair color newbie, and I think I understand the underlying color theory but I have two practical questions:
Determining the level of deposit color for 1-step coloring:
Let’s say I want to lift level 2 brown hair to a level 4 or 5 brown in one step using Wella Koleston Perfect. I understand that I should use the 20 volume developer to accomplish this.
But how do I choose the deposit color? I know not to use Wella Koleston 5.1, because the deposit color should be lighter than the target color. But how much lighter? Is there some kind of equation for determining the proper deposit color, or do I need to consult the formulation chart for each manufacturer?
Determining the level of deposit color for 2-step coloring:
Let’s say I get skeptical about the 1-step concept and decide to pre-lighten. In this scenario, I would lift the level 2 hair to the dark orange stage before depositing color. Do I still need to choose a deposit color that is lighter than the target color (example: using 6.1 to achieve a level 5 target color), or would I choose a deposit color that is the same level as the target color (example: using 5.1 to achieve a level 5 target color).
I would appreciate any insight into these questions that the more experienced colorists on the board are willing to offer. I hope to understand the underlying concepts so that I can eventually experiment with hair color on my own instead of simply following the instructions.
------------- -- conveniently shortened to "Anne".
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