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Has anyone noticed that...

Spontaneously? Maybe under the right circumstances. Have you ever removed used filters from a spray booth in which ncl has been sprayed and struck said filters with a hammer?
Isn't guncotton used in making flashpaper? I would assume that a filter covered in nitro would act in a similar fashion.


There is an old story that before they found a way to cure nitro, the billiard balls they varnished with celluloid would often combust if they hit another ball hard enough.