Pigment detectives
A laser reads the paint on a possible da Vinci
A portrait of the Roman emperor Domitian carries a signature, "L daVinci," that shows only when light hits it right. Uppsala University scientists shone a laser on specks of its paint and named 13 pigments. Twelve existed in Leonardo's day. Prussian blue, first made in the early 1700s, turned up in two spots, including the laurel wreath: a later touch-up, not proof of a fake.
For little hands: Paint a picture with three colors, then add a fourth later. Can a friend spot which color came last?
For grown-ups: Look up when your favorite paint colors were invented, then try a small still life using only colors from 1500.
Read the full story at Uppsala University uu.se · Image: Uppsala University











