Cleaning 150-year-old varnish from a Frans Hals portrait | National Gallery Channel: The National Gallery48K views • 4y agoRelated VideosHow did Frans Hals transform portraiture? | National GalleryFrans Hals: Four Sensational 17th-Century Portraits | National GalleryWhy did Frans Hals paint monsters in his friend's portrait? | National GalleryFrans Hals at the National Gallery
