Title: Sparse & elementary.
Product review: Does not touch on meaningful corrective hair color techniques. Very little info or content here, and what is here is outdated. Rather insulting to put this before any reasonably educated person much less a student or professional. Lots of so-called "exercises" that take up lots of white space and yield nothing of substance relating to corrective hair color. The color wheel info and theory can be found in childerns' books. Disappointing...actually a rip-off. I've asked for a refund.
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