anti brass mask

I have natural blonde hair.. I have never coloured or highlighted my hair. I was a bit afraid to use this product as some people said it turned their scalp purple! I only used half the bottle and left it on for 3 minutes. It smelled good and left my hair feeling soft. I think it made my hair look a bit darker and my grey hairs stood out more. They are normally hidden in the lighter parts of my hair. So I didnt really like this product. It is probably more appropriate for people with coloured or highlighted hair.