Approximately how many shampoos does this last?

For me it lasts between 8 and 10 shampoos. About two weeks. But I am hopingthat continuous usage will tint the hair permanently to some degree. It is very mild on my hair and I like it. I was told by Cosamocustomer service, that the tint will stay in longer the more I use thecoloring. So far I have been using it about 3 to 4 months and I am happy with the results. If you use the medium brown, there is a tendency for a slight lavender shade that lingers in the gray before you dye it again. But it is not that noticeable except in direct light. So now I use a golden brown color with much better results.

Has anyone else who used Medium Brown had someone tell you that your hair looks purple in the sunlight? Am I leaving the product on too long?

Left it on for 20 minutes without a problem. My daughter who also has brown hair left it on for 30 minutes and her hair had a purple cast to it.

Does the medium ash brown shade fade to purple on white hair or just a light brown?

Medium ash brown has never faded to purple on me, but just to a lighter golden brown in streaks around the front which I actually like. It's the best hair colour I've every used.

Cosamo Non Permanent Hair Color, Brown, Medium

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