Crossword Genius

Hans van Meegeren was proved to be a forger of Vermeer by his anachronistic use of ____ blue (6)

Ross

I believe the answer is:

cobalt

(Other definitions for cobalt that I've seen before include "Deep blue pigment" , "kind of blue" , "Metallic element, Co" , "Magnetic metal" , "Metal giving its name to type of deep blue" .)

I've seen this clue in The Times and The Sunday Times.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.