Henna

Henna was a southern plant that was most commonly used to produce red dye, used in body decoration and textiles.

Usages
In the nation of Calimshan, henna dye was used to color fingernails by some, while others, used it to dye hands of the slaves, practice that dated back to the Calim Empire. The practice of coloring ones nails with henna spread to the Sword Coast North and Waterdeep by the 14 century DR.

Bedine folk of the great dessert Anauroch used henna juice and other dyes to color their khreimas.