Home Cosmetic Science Talk Formulating General Off Topic Grams, cups, oz, parts

• Grams, cups, oz, parts

Posted by on May 18, 2020 at 10:46 pm

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?

3 Members · 4 Replies
• 4 Replies
• OldPerry

Member
May 18, 2020 at 10:54 pm

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.

• Olivia_76

Member
May 18, 2020 at 10:59 pm

Thanks, that makes sense to me now. a-ha moment

• Pharma

Member
May 19, 2020 at 6:24 am

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.

• Olivia_76

Member
May 19, 2020 at 8:53 am

Thanks ????