Exhibition on Madrid museum’s copy of the Da Vinci sheds new light on the original

Catalogue raisonné rejects unusual part-painting, part-sketch, as expert says the “colonial” nature of the composition is not the artist’s style

Investigators found thousands of fakes, as well as tools and materials used to make them seem ancient, in rooms near Sadigh Gallery’s Fifth Avenue showroom

Works by a non-Indigenous artist known as Harvey John were sold at museum gift shops and galleries as authentic Haida artworks