Those are the events where generations of Lehigh Valley residents learned to love the many varieties of soda produced in A-Treat's east Allentown factory: the cola and cream soda, the birch beer and ginger ale, the grapefruit and black cherry and sarsaparilla and Big Blue - the blue raspberry variety that was colored like nothing in nature but was catnip to sweet-toothed kids. A-Treat Bottling Co.