Cosmetic Science Talk
Grams, cups, oz, parts
Another question! Please. Hear me out
What's a part in a recipe? I see lots of formulas that ask for 1 part lavender oil 1 part lemon oil etc. Equal amounts of each?
Administrator, Professional Chemist
Well, assuming that they are using the terms consistently, a part just refers to an equivalent amount. Specifically, when talking about a liquid I would think it is a volume measurement.
So, if you have 1 part lavender oil and 1 part lemon oil, you would figure it out like this.
1. Add up all the parts. (1+1=2)
2. Figure out the % by dividing parts by the whole.
Lemon oil = 1/2 = 50%
Lavendar oil = 1/2 = 50%
The % should equal 100%
If, for example, it was 3 parts lavender oil and 1 part lemon oil the calculation would be this
1+3 = 4 total
Lavender oil = 3/4 = 75%
Lemon oil = 1/4 = 25%
Formulating should be done in % and all the measurements should be made in mass (grams). Cups, ounces, parts shouldn't be used.
Learn to formulate cosmetics
Thanks, that makes sense to me now. a-ha moment
With fragrances, parts may actually be a 'valid' measure. Regarding scent profile, relative amounts of the different EO matter. Total amount simply imparts more or less scent to the final product and that is up to the manufacturer's likings.
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