Is it even possible to dissolve a limestone matrix without damage to the calcite fossil covered by it? Is there a solution strength that would not affect calcite yet would be able to loosen or dissolve attached limestone? My objective is in fossil preparation, being unsuccessful in my search to find an appropriate chemical or acid concentration that won't do damage to calcite fossil such as a crinoid from the Middle Devonian era. Muriatic 6%, vinegar, even Sno-Bowl commercial cleaners all damage both the calcite and the surrounding limestone no matter how thin the limestone layer. Shale cleaners such as the Larry Osterberger solution, RockQuat, etc. do no damage to calcite or silica fossils but is ineffective on limestone. Any suggestions?
