I wonder if they would still tarnish in one of those sleeves?<br>Because it would look amazing if it was polished.,(reply>), @Wild Blunt Hickok fair enough,(reply>), The tarnishing is from oxidization. So if it's airtight, no.<br>But supposedly removing the oxidization from any antique lowers the value. Thankfully the US decided not to do that when they refurbished the Statue Of Liberty in the 1980s. Can you imagine if they had turned the copper statue red again?