I know, and I also disagree with such a low limit. But I do understand it is a specific reasoning behind the limitations, so I am fine with it (now, lol). I know how to make the best out of my recipe with the fragrances and limitations, and I am making sure I only use the oils that performs the best in lower concentrations, so nothing feels like a waste.That is interesting, and it makes sense to me why 10% of the water weight was chosen. I suspect it has to do with anticipated water loss after cure, with the expectation being that 90% of the water weight is lost, and therefore the 3% would be the correct portion for the Net Weight of each bar of soap. Someone really put a lot of thought into the calculation for fragrance usage.
Of course, I may disagree with the 3% limit, but the rational for how the percentage is calculated is brilliant, IMO.
I have three essential oil variations that I have in my assessment - Rosemary & Spearmint, Lavender & Lemongrass, Lime, Fir & Cypress (french). They stick quite well, and are not too weak to be noticed, even after a year.
What I found interesting is that my assessment has quoted recommandations from Tisserand when it came to safety, usage rates etc. So his work is listed in my safety assessment, and since I have his book I recognised the things that were quoted. No other sources were mentioned at all when it came to essential oils, so his work seems to be regarded as the best, at least for my assessment team, since they used only his work as the scaffolding for essential oil safety in their work.