used by women in ancient Rome was discovered during an archaeological dig in London (left). The cream, which the scientists posit was used as a foundation, contains refined animal fat, starch and tin oxide. According to a report in this week's issue of Nature, this form of tin has no medicinal value, which suggests it was used solely as a pigment. What is more, its nontoxic properties would have been a plus, because the health risks of lead were becoming recognized by second century AD. A version of the cream produced by a team at the University of Bristol (right) initially felt greasy to the touch, but soon dried to a powdery, whitish finish.