Here's how to dye your faded or graying blond hair with cassia obovata:
- Mix cassia with enough lemon juice or orange juice to make a paste as thick as yogurt. Let the paste sit about 12 hours. Section your hair and apply the cassia thick, as you would cake frosting into all the sections and down to the scalp. Wrap your hair in plastic wrap to contain the slop. Leave the paste in three hours. Rinse out and shampoo. Your gray or faded blond hair should feel heavy, thick and silky, and have a lovely youthful golden color. Source