Gradually disappearing beneath a mottle of foxing and fading, a 1512 red chalk drawing believed to be a self-portrait by Leonardo da Vinci is on rare public view in Italy. The believed 1512 red chalk ...

The only widely accepted self-portrait by da Vinci has developed red blotches, fungi, and spots, referred to as "foxing." The small size of the work (it's only 13.2" x 8.5") combined with its extreme ...