Alkanet Root:

Alkanet Root, Anchusa officinalis is the root of the Alkanna tinctoria plant.

neneeys 

The name alkanet comes from Arabic, al khenna (henna), from the red color of the roots that have been great source of natural color. Alkanet Root is usually used to produce a natural blue or purple color in the soap. It was once used in Western Europe as rouge and is also used for producing natural dyes for fabrics. This root is rarely used therapeutically, although it has astringent and antimicrobial properties and when used in an ointment, it can treat wounds and relieve skin inflammation. Oil made with alkanet is an emollient that is soothing and softening to the skin.