## Saturday, June 13, 2015

### Weekend Wonderings: Do we use weight or volume measurements?

From this post, Conditioner!, Karen asks: When formulating your (conditioner) recipes, do you go by weight or volume?

And Crystal asked in the Lotions: Adding the additives postI am NEW to lotion making-mostly I do oil, water and emulsifying wax. And I have grown used to using teaspoons, and ounces. I don't understand how to use the percentages way. Of course, it seems way more precise. Do you have a tutorial on how to convert or interpret percentages when formulating a lotion.

Let's check out this post - how to convert recipes from percentages to weight - from the FAQ!

All the recipes on my blog are in percentages and they should add up to 100% (although there are some differences in the amount of preservative used). The easiest way to convert the recipe is to think of the percentage sign as the word "grams". So if you see 70% water, you'd use 70 grams of water. 15% oil would become 15 grams of oil and so on. The recipe will total 100 grams of product.

But let's say you want to make a really large batch of lotion to give as Christmas presents. Substitute the percentage sign with grams, then multiply by how much you want to make. If you want 500 grams of lotion, you'd see the 70% water as 70 grams of water x 5 for 350 grams of water. 15% oil would be 15 grams x 5 for 75 grams of water. And so on. You'd have 500 grams of product.

Why do we weigh our ingredients? For accuracy. Using cups and teaspoons aren't accurate, so we might end up with more or less emulsifying wax than we need, which can result in an epic lotion fail or end up with more beeswax than we want in a lotion bar, leading to drag on our skin. It makes it easier to replicate that awesome recipe you made last time, as well.

If you're curious, the scale above is a Salter diet scale I bought from London Drugs for about \$33. It goes to 0.01, which is pretty awesome! (This isn't an endorsement. I make no money if you click through. Just sharing my new purchase!)

Michelle said...

Perfect timing Susan. Spent several hours this morning with my (oh so patient) husband, as he tried to help me understand weight vs volume vs ounces vs grams. Thanks for the "think of it as a gram" tip.

Kelli Spears said...

I have another helpful suggestion for anyone who has a hard time figuring the conversions, or people who just don't like doing the math part of it. I know some people just don't like math.