I usually just make guesses when it comes to scents, because some are stronger than others. I have a sensitive nose, but my customers like strong scents, it's a balancing game. It will smell a little stronger in liquid form than it does after it's done. Something I noticed about Grapefruit EO, is that if you let the soap sit unused for a while, the scent starts to fade out and 'escape' (I started to notice after a month in a plastic container), but if you plan on using/selling it right away, that shouldn't be a problem.
I've never had a soap act differently enough to notice just from the fragrance oils; I've only heard about changes like that with CP soap.
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