Date: 12/19/2001 8:08:22 PM (GMT-7)
IP Address: 188.8.131.52
In Reply to: How the heck posted by Ben
Probably an estimate based on the known chemical properties of the dye. It will decompose/dissociate/whatever at a known rate, so a time can be estimated at which point the dark and light spots would no longer be discernable by a reader.
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