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Oh I just need sugar then marrow rum is next!

Any spirit will fortify, HH - but most will also modify the taste. The usual thing quoted is Polish Spirit - an extremely strong vodka. I've never, ever, seen this stuff on sale. Ordinary vodka, then, for me. It certainly does the job and has no taste effects.

Mike

Cheers mike very helpful, I will try this at the end of fermentation , and will try to avoid the cheap stuff that send you blind!