For Black Shell (Or Blind Shell) we have a term and definition in Pyrotechnics.

A shell whose time fuse fails to ignite the bursting charge and falls back to earth without bursting. Sometimes the shell will be ignited by the impact of its landing, particularly if it has shock-sensitive chlorate mixtures inside. It could also be ignited by leftover sparks on the time fuse being thrust into the burst charge upon landing.
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