Art gum is a type of adhesive made from natural rubber, tree sap, and CHICLE. It is used as an ERASER to remove pencil marks from paper. The term 'art gum' is derived from the combination of the words 'ERASE' and 'tree, ' which are both found in the crossword solutions. The word 'CHICLE' is also included in the solutions, which is a type of gum traditionally used in Mexico and Central America. Art gum is a versatile and useful tool for artists, writers, and students alike.