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No, because the rule is "an" for words that start with vowel sounds, and "a" for words that start with consonant sounds. It would be "an" if the h was silent.
I dunno, it's not bad, and it seems to actually have a meaning under it all (unlike a lot of poetry we get here which is just about words that rhyme and Angsty McAngst.) I like the shape it takes, although I think the rhythm could be much tighter in places.
i was very impressed, it is an excellent poem, i would be interrested to know what the inspiration for it was? i like the concept of becoming tainted. and "A hidden core" is right, though its a poem it doesnt really matter