Review (5/5): Works really well.  Best one I have found but stains skin if touches it.
I leave it on much longer then recommended and it must be lathered really well. Be sure to wear gloves as it will stain your skin and get under your nails. I line my scalp line with coconut oil, or some kind of heavy skin lotion so the product does not stain my brow line purple ( around my ears too). Make sure you lather it so the color is no longer purple but almost a white color and leave it in for a very long time. It will stain stone tiles is your bathroom floor or shower is stone or a porous material so when rinsing, I do this over a sink for the initial rinsing so my tiled shower and even the grout does not get stained. Also, if you have blonde tips already, and you have not lathered this product enough so that the color is still purple? Your tips will absorb the color and you may come out with purple streaks (which may be ok for some of you, but when you are in your 50's, ya, not so much :))). If this happens, you have to wash it out again and again. it does eventually come out. This product tends To dry your hair out so condition it really well after using it.
I HIGHLY recommend it for the yellowing of colored hair, so you can have it look like a nicer blonde. I use it all the time and a little bit goes a long way. One bottle will last a very long time!!!!! I have tried to mix it with a conditioner and use it (thinking it would mimic what you get in a box color care treatment) and it is not worth it. Just use it straight, lather it well with water, and leave it on for a while. I sometimes will just get my roots very wet and do them if they are getting that nasty yellowing from the colored treatment. If my tips are the right blonde at this time; I put conditioner on them so the product does not discolor them purple, and it keeps them protected and moist during the rinsing. You can even use this when your hair is not perfectly clean too. It is drying to the hair so condition it really well after treatments.
I HIGHLY recommend this. Takes a bit to get used to and just remember; A little bit goes a very long way!!!