When you use too much of either ingredient, the pH level of the hair will alter drastically and the cuticle will have difficulty closing after the colouring treatment.
When the cuticle is unable to close, shine does not reflect off the scales. This is because they’re dishevelled and open, instead of tightly packed down.
Another important factor is that the hair colour fades faster when using too much MEA, because of the cuticle’s inability to close and lock in molecules.
NATULIQUE hair colour only contains 1,5% Ethanolamine.
Read more about this process and how it works in this article about ammonia free hair color.