It is not a shampoo.... It is pure dye.
You need gloves because your hands get stained and you need to be careful when applying it.
I dried my hair with a towel which turned a dark blue-purple color, and I don't know if it will come clean.

Terrible product, not only does it not cover the whites but it also dulls the other hairs and in the end you have a blurry hair.
It stained tiles in the bathroom and a pillowcase that never came out no matter what we washed it with.
No results, it only caused damage.

It doesn't do what it says! It stains everything, dyes the hands, the skin, the sink, everything except the hair! Stay away, complete failure

In a word, PERFECT for its usefulness to the consumer and at a very affordable price.
I highly recommend it!!
You will use it for a lifetime!!

You apply it together with the shampoo and leave it for about 10 minutes with a strong massage. It does the job after a few days. I used it for about 8 washes. It's not exactly a color shampoo. As a brunette, it covered some gray hairs. It looks good. It will show in the future.

It is something like a gel-dye, it temporarily darkens the hair a little, but as soon as you wash it, it comes off and stains the pillows. Obviously, the result is not permanent, after a month of daily use, it did not have the desired effect. I will not buy it again.