Color Theory
Levels, tones, developer and underlying pigment, explained in plain terms.
Posts
Color Theory
Gray Coverage Formulas: Percentages, Naturals and Developer
How to estimate gray percentage, when to add naturals or gold naturals, and how Majirel, iNOA, Koleston Perfect and IGORA Royal set coverage.
Updated
Color Theory
Developer Volume Explained: 10, 20, 30 and 40 by Job
What 10, 20, 30 and 40 volume developer do, and how Redken, Wella, Schwarzkopf, Matrix and Goldwell state developer and ratio.
Updated
Color Theory
Why Natural Roots Go Brassy With Permanent Color
Why permanent color turns virgin roots orange or gold, and when to switch the root formula to a demi at the natural level.
Updated