The toning is too deep. Leave it be. Conservation should be used for light surface contamination or surface stabilization. On a coin like that, you'd end up with an ugly washed out piece, and you might get the unpleasant surprise of finding a bunch of hairlines.
I'd leave it alone. I see what appears to be milk spots. "Conserving" the coin would cause more contrast beween the "milk spot" and the freshly revealed metal.
Today's mighty oak is just yesterday's nut that held its ground.
Russ is probably right but the tone could be light enough for it to dip out well. Probably dipped years ago and that is the retoning from it and it will probaly continue to detoriate.
Change that we can believe in is that change which is 90% silver.
Comments
Depends. Is there something on the coin that is causing it to deteriorate?
Doggedly collecting coins of the Central American Republic.
Visit the Society of US Pattern Collectors at USPatterns.com.
if you just don't like the tone, sell the coin & buy 1 you do like. it's a simple solution. ie. why did you buy a coin that you might not like?
K S
What year/mm is it?
President, Racine Numismatic Society 2013-2014; Variety Resource Dimes; See 6/8/12 CDN for my article on Winged Liberty Dimes; Ebay
Russ, NCNE
Probably dipped years ago and that is the retoning from it and it will probaly continue to detoriate.