I use FO's that I soap with regularly when making recipe changes. Although my original RBO test done two years ago was a new FO, and now I'm kicking myself a bit. I would have liked to compare the FO after aging in the new recipe to the aged original recipe. I'm always curious how soap recipes change in smell after aging, and how that affects FO's. I've noticed the scent change in some of my original unscented bars as I tried various recipes, so have to believe the overall smell with an FO would change too. [it creeps my husband out that I spend a crazy amount of time thinking about stuff like this. It's normal, right?]