I hate to bring down the good reviews but this just didn't work for me. For the last 3 years or so I have been using the Ion brand from Sally's which I absolutely adore. I have medium blonde hair which I usually lighten with 9v, 10v or 10a. The last time I used it was with the 12v high-lift because I wanted to go more platinum. It worked really well. When I was at Sally's to pick up more the SA was signing the praises of this line to another customer. It sounded great so I thought I would try it. I purchased the 12a high-lift (with ash tones).
It does smell nice & seemed gentle but that's about the only thing good I can say. It did not lift my new growth very much and made it very gold. The previously lightened areas were very ashy, almost green tinted. I followed the directions precisely and use a protein filler before hand. I had 2-toned hair that didn't look great.
I waited a month and used my Ion 12v and my hair looks great again. All one color again. The darker colors may work very well and based on the reviews they must. But I would warn people about using the lightest or high-lift colors.