Tappa bark is a type of tree bark often used for traditional paper-making in India, Pakistan, and Nepal. However, there are several other synonyms for tappa bark, such as lokta bark, daphne bark, and mulberry bark. Lokta bark is one of the most commonly used materials for handmade paper production and is known for its durability and flexibility. Daphne bark, on the other hand, is widely used in Bhutan and is known for its thickness, strength, and resistance to insect damage. Mulberry bark, meanwhile, is often used in Japan and Korea and is known for its smooth texture and light color. All of these tree barks have unique properties that make them valuable resources for paper-making.