"I have been using H-15 every month for the last 10 years always with good results. I used it today, same circumstances I always do, and my hair turned goth black. Before I had started my second sideburn, the color appeared darker than usual. Having done this so many times, I figured it was something strange. I colored my hair quickly, washed it off 2 minutes later, and my hair is embarrassingly dark. Like I play lead guitar in a goth band. I confirmed the color is H-15, lot number on box is Z24D065. Plus my skin and ears were heavily stained as well, which never happens. So disappointed. Please let me know how to file a 100% guarantee issue."