L'Cosmetics / Solid shampoo conditioner 2 in 1 "With blue clay"

I adore solid shampoos. I use them more than three years. L’COSMETICS has the whole line of solid shampoos. Having tried everything, I gave preference to blue clay. In view of the fact that took place to be low-quality hair-dyeing, the problem appeared: hair became lifeless and dim. Blue clay is declared by the producer as "restoration".
What is, actually, blue clay in itself? Clay and its curative properties are known and are applied long ago... To read further"