وقد خضب الأئمة عليهم السلام بالوسمة، والخضاب بالصفرة خضاب الايمان، والاقناء خضاب الاسلام وبالسواد إسلام وإيمان ونور.
The Imams have used wasmah (a natural dye), and dyeing with yellow (or light colors) is considered the dye of faith. Dyeing dark is the dye of Islam, and dyeing with black is both Islam, faith, and light.