A Pennsylvania woman’s $12 auction purchase could turn out to be a priceless masterpiece by French Impressionist Pierre-Auguste Renoir. Heidi Markow’s discovery, believed to be a charcoal drawing from Renoir’s “Ingres period,” is currently undergoing authentication by the Wildenstein Plattner Institute. If confirmed, this remarkable find could fetch six or seven figures at auction, transforming her modest investment into an extraordinary windfall and highlighting the thrill o