Travelling hair exhibition! I suppose 19thc museum displays never considered light damage would be an issue, but if Napoleon's was kept in a locket it would keep its colour (thinks - so the later black was dye?! Maybe that's the arsenic source! I like the long whitish hair in one of the earlier portraits - very romantic poet! - though I had just assumed it was a loose wig, because it looks so different to the dark 'brutus' cut he has later)