“The saga of the $1.5-million abstract Helen Frankenthaler painting defaced two weeks ago at the Detroit Institute of Arts by a 12-year-old boy who stuck gum on it during a school outing is heading for a happy ending. After intensive research, experimentation and surgical work with high-performance tweezers, hand-rolled Q-tips and a fast-evaporating solvent — plus some purposeful fooling around with gum — the quarter-sized residue on Helen Frankenthaler’s ‘The Bay’ is gone.”