How Things Look on Instagram: "For centuries, many old masterpieces have been hidden beneath layers of yellowed varnish, applied long ago to protect the paint but which darkened over time. A 1617 portrait recently underwent a careful restoration where experts slowly dissolved and lifted away this thick coating, revealing colors and details that had been muted for hundreds of years. The process is painstaking, requiring delicate tools and chemicals to avoid damaging the original paint. But once c