Never Underestimate the Power of a Paint Tube ... struggled to keep his oil paints from drying out before he could use them. At the time, the best paint storage was a pig’s bladder sealed ...

W HEN AN OIL painting is dried and finished, it is supposed to stay that way. Yet when Ida Bronken, an art conservator, began to prepare Jean-Paul Riopelle’s “Composition 1952” for display ...