I've tried henna for the first time about a week ago. I'm two washes in, and it's lost a lot of color. It's basically an undertone now, except for my ends. My hair was a beautiful fox-orange when I first rinsed it off. (edit: it's not so bad in bright natural light, but I swear I'm almost back to my natural color in low lighting)

I use very gentle hair care products without silicones, but used a clarifying shampoo before henna. I've let the mixture sit overnight, I left it on my hair for 3 hours and waited 3 days before washing it with shampoo. My bathwater was kind of muddy/orange both times (I bathe and then shower off).

What did I do wrong?