Yep.  The problem is that the heating and ignition seems to be pretty unpredictable, otherwise you could carry a wad of cotton and linseed oil camping to light a fire.  That unpredictability is the annoying part, and I've certainly never seen it.   
 
It's not hard to fix, so it's worth cleaning up properly.  Otherwise, linseed's lovely stuff. 
 
Best, 
 
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