Carefully look at these 4 glasses.
Although they are all light brown, 4a is clearly the lightest and 4d is clearly the deepest.
This is the difference between translucent and opaque.
This slight difference is achieved by using a concentrate and helps you to get better gray coverage and longer wearing results. The more concentrate you add, the deeper the color becomes but remains the same level. (Yes, you can add too much.)
Concentrates are available in Neutral, Green, Gold, Red and Blue and each alters color in a specific way.
I used Gold for this demonstration.
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