I recently tried it. It doesn't last as long as they say, thank goodness. Pick two shades lighter than what you want.
I used a 7A and it came out dark brown. I wanted to cry because my hair is a dark blonde color.
I've only washed with low poo once a week since I did it about three weeks ago and it has faded much closer to my natural color.
It was much more gentle to my hair than permanent colors with strong developers I had been using.
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