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I've been playing this game for a while (more when i was a wee lad) but I can't seem to remember or find out how to use the darn healing potions! I've tried double clicking, drag and dropping them shift, ctrl and alt clicking but I can't seem to get them to work. I remember back in '95ish I had an aha! moment and got them to work but I can't remember for the life of me what that revelation was. Anyone care to help?

tl:dr how to use essence o grace potions