Odorless, Acid-free, Xylene-free, Non-toxic. Glue is Blue when wet but turns clear when dry. This versatile color-changing formula is 2-glues-in-one, with many uses for home and at work. For a permanent bond, use when the glue is wet (blue). For a temporary (re-positional) bond, use after the adhesive has dried to clear. Zig Memory System 2 WAY GLUE is great for: Memory Books, Scrapbooks, and much more!