just a guess but your shells are somewhere between 80 and 100 years old...as for displaying the shellsi would just wipe the dust off them and display themanywhere but direct sunlight..i mean like dont put them by a window that light would hit them....theres no way that i no of to keep black powder from seeping through and corroding the brass..other than removing the powder but then it wouldruin the shell in my opinion....you made a good find display them proudly not many people fortunate to find such gems.... charlie
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