I am wanting to make a super simple salt scrub. The plan is 1/2 cup coconut oil, 1 cup epsom salt. I am wanting to use the Crafters Choice Vanilla Cream Fragrance Oil that I have in it. I will weigh out how much half a cup is and then figure out how much fragrance oil to add, but do I use the 19% that is for lotions and perfumes or 6% that says for face cream?