A hidden painting has been found by scientists beneath the brush strokes of The Blue Room, a 1901 Picasso artwork.

Art experts and conservators at The Phillips Collection in Washington used infrared technology on the masterpiece, revealing a bow-tied man with his face resting on his hand.

Picasso created both works in Paris during his famous blue period.

"It's really one of those moments that really makes what you do special," said conservator Patricia Favero.