The colors and fragrances of natural Thai herbs bring beauty to the bath. Chalisa Boonsiri presents a set of four hand-made organic soaps. “Sesame soap was used by our ancestors for a soft complexion,” she says. “I add milk for a fresh cleansing action, and raspberry oil to soothe the mind. My honey-lemon soap is designed to heal and prevent acne, and my peppermint-mud bar is an excellent cleanser…