I read somewhere, maybe here, that you can light the tabs with a ferro rod if you scrape them to make shavings/powder. I've never tried it, but fatwood and shoe fungus work the same way so it makes sense to me.
No luck with that for me. I could not get it to light with a butane lighter until I broke it in half. It lit readily then.
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Warning - I am not an expert on anything having to do with this forum, but that won't stop me from saying what I think.

Bob