When going thru a box of boating stuff I bought at an estate sale, I came across numerous expired date hand held smoke flares, SkyBlazer Arial Flares and Flare Pistol Cartridges... Some have been expired more than 10 years... What is the proper and safe way to dispose of them? If they were a year outdated, I would keep them as extra backups for the current boating season, then use them on the 4th... but 10 yeras old is to much to even think about messing with.. How to Dispose?