"Fragrance oil" refers to a concentrated liquid that contains pleasant scents and is used to add fragrance to products like candles, soaps, and lotions. Full definition
Luckily with this homemade rose soap recipe we can substitute it for a rose fragrance oil. (savvyhomemade.com)
For fragrance oils, look to the packaging of the oils to determine how much fragrance oil you should use given the volume of soap you're working with. (mommakesjoy.com)
Also the only fragrance oil I have found is honey almond so I hope it smells alright. (mommakesjoy.com)