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pure titanium burn on rubbing with pure titanium but titanium melting point is highr (1650`c)
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pure titanium is soft in nature..
so.. while rubbing.. it get heated & not actually burns but
it generates spark..
that show Ti burn
so.. dats y..titanium used in fire-cracker works..
as like
~Ti powder mixed with potassium-chlorate & sucrose
~Ti. with potassium-perchlorate (K-Cl-O4)