Coins from a fire

I looked at a collection of silver dollars last night and several looked like they had been through a fire. Unfortunately, some of them were the tougher dates from the early 1890's. The fire coins are very dark and have flecks on them that almost "sparkle." I assume that they are lost causes as far as restoration. Does anyone have experience "saving" coins from a fire? Anyone have a story of coins surviving a fire?
"Let me tell ya Bud, you can buy junk anytime!"
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-Paul