When you think of walnut shells, you probably picture a nutcracker. But the hard brown shell is actually the stone. Walnut shells are the green, smooth, fleshy outer layer of the fruit. The walnut tree is one of the oldest trees in the world and has been used as a nut tree since the earliest generations. Originally native to the Mediterranean, the Balkans and the Near and Middle East, it has been cultivated in Europe since Roman times. Honoured as a symbol of fertility, it became very popular as a universal household remedy. Even today, the roots, fruits and leaves of this versatile tree all have uses. The green fruit shells are collected at harvest, air-dried and then ground to a fine powder. Walnut shell powder is a traditional natural hair dye, giving your hair a warm brown tone and silky sheen. It also surrounds the hair, protecting it from environmental influences and giving it more volume. So it’s especially suitable for fine hair.