Catechu is extracted from the wood of the Khair tree. Not only this, Catechu is red and white. Along with making the mouth red, it is also very beneficial for health. Its effect is cold.

"This supreme Amlaki tree, beloved by Vishnu, is said to grant the fruit of ... The observer of this vrat should also listen to the Amalaki Ekadashi vrat katha after finishing the puja rituals. The ...