Re: Not much of a chemist then?
>>because that money has to last 20-30 years in the field without any kind of maintenance.
Where did get those lifetimes? They are crazily optimistic.
How long does money last? That depends on the denomination of the note. A $1 bill lasts 18 months; $5 bill, two years; $10 bill, three years; $20 bill, four years; and $50 and $100 bills, nine years. Bills that get worn out from everyday use are taken out of circulation and replaced.