Natural Instincts Temporary Hair Dye hasn't washed out after 6 months?

I dye my hair quite a bit and the one thing I swear by is Color Oops it can be found in the same aisle as the hair dye. It works great, doesn't ruin your hair like bleach and can remove color that was in longer than a year. It will bring your hair back to the light shade that you have had it. If you don't dye it often then I imagine it would bring your hair back to its natural shade.