مؤكسد للشعر %3 Kallos Cosmetics KJMN Hydrogen Peroxide Emulsion

This product is really good, I have been using it with different brands of dyes such as Ducastel, FarmaVita, Matrix, and Mirella. It works perfectly fine.

Satisfied. If you dye your hair in dark shades - I recommend it.

I bought paint from a different brand, but they didn't have the "matching" developer in stock. So, I decided to go with this developer for the following reasons:
1) It is made in Europe
2) It has a good price

I received a bottle with a good expiration date (until 2017). The developer has a fairly strong smell (keep in mind, this may be a downside for some people, but personally, I don't mind). It also has a liquid consistency, but since the paint is thick, the mixture turns out fine. It is convenient to apply the mixture to the hair because of its thickness (again, if your paint is liquid, the mixture may end up too runny).

I have a few strands of gray hair in my bangs, and I was able to cover them (although they turned out slightly lighter). The roots of my hair also lightened by about half a shade.

Before using a 6% developer to bleach your hair, try using a 3% developer, it might be enough for you. I used a 6% developer before and it dried out my hair.

For covering gray hair with a 3% developer, there are two techniques: "mordonage" and "pre-pigmentation." I used the first one.