Spot the difference: Bridget Riley work enjoys new green cleaning treatment

Tate Britain has completed the first-ever cleaning of Bridget Riley’s landmark 1964 Op art painting, 'Hesitate,' using a pioneering 'green' conservation method. Developed through the international Greenart research program, the treatment utilizes specialized hydrogels that lift dirt from the surface without the mechanical pressure of traditional swab rolling. This breakthrough allows conservators to safely clean the sensitive, unvarnished polyvinyl acetate house paints Riley favored, which were previously deemed too fragile for standard restoration techniques.