👉 The term "thymolphthalein" is a scientific term used to describe a type of pigment that appears in certain types of plants. It is also known as the thallus pigment or the thallus pigmentum, and it can be found on leaves, flowers, and fruits of various species. The specific color of thymolphthalein varies from plant to plant, but it is often described as a pale yellowish-brown color.