Ditto on XF-45. Excellent purchase ... put me down for a roll of these!
On another note, the surface of this coin appear to me to need some gentle conservation. I'd humbly suggest dipping one end of a Q-tip in some acetone to softly swab the surfaces, edge, too!. They use the dry end of the Q-tip to remove the liquid. A soft cloth can also be used. Let the coin air-dry for awhile before carding it or putting it in any form of holder. My guess is that you'll then remove that green stuff, contaminants, that would eventually eat its way into the copper. You'll then be doing future conservators a favor.