f/o
fragrancing is one of the greatest challenges in soapmaking! each vendor seems to be different. i use a measuring glass you can get in the kitchen isle of walmart. on the sides it has up to 4 oz in .25 oz increments.
when they say 5% f/o is that per pound of oils or per pound of soap?
example: 5 pounds finished soap= 80 oz x 5% = 4 oz fragrance oils.
when they say .7 oz ppo-per pound of oils:
example: 3.5 pounds of oil x .7= 2.45 oz round up to 2.5 oz
when in doubt, i use more-i'd rather have it a bit strong than have it too week.
i always keep a journal of fragrances i use. that way 6 months from now i can go back and see how much i used and how it performed.