http://www.bbc.co.uk/news/health-17773007 Seems that there is a "rash" of allergies in the UK... Ruben
I am allergic from being away from my coins for too long, does that count? BTW IKandiggit, don't forget copper. More copper coins were issued than ever were struck in silver or gold. Sometimes this copper was purified with arsenic or many other nasty little chemicals, so I wouldn't go so far as saying they were perfect in that regards. I appreciate the ancient coin shoutout though.