How long does a Morgan have to be in a mint sewn bag in order to aquire monster colors?

And, if it sits too long in a mint bag will it go black? Why is it only on Morgans? What's the record price for a common date toned Morgan?
Seth
Seth
Collecting since 1976.
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Taking all these into consideration, perhaps 15-20 years, if left undisturbed in the canvas bags.
Some of the silver dollar bags were left in the Mint storage for 30-70 years, or more.
Camelot
<< <i>...and how many licks does it take to get to the center of a Tootsie Roll Pop?
The owl said "A one... a two... (crunch)... Three.... Three licks to the center of a tootsie roll pop!"
can make one of those wonderous, beautiful and unforgetable toned silver coins.
Camelot
<< <i>Time is only one variable. One must also consider Humidity and temperature.
Taking all these into consideration, perhaps 15-20 years, if left undisturbed in the canvas bags.
Some of the silver dollar bags were left in the Mint storage for 30-70 years, or more. >>
......................................very good point bear.....humidity, and temperature, play the biggest part on how long it takes for them to tone......if left untouched, and under the right conditions, at least 15 plus years.........