Natrasorb Bath (INCI Tapioca starch) isn't the kind of tapioca starch you can buy from a regular store. It's modified so it can hold a ton of oils - carrier oils and fragrance or essential oils - in a powdered state. It's hydrophilic - meaning it likes water - and it can absorb oils easily. When you're making something like bath salts or bath bombs, Natrasorb Bath will help fix the fragrance to make it last longer.
Do not confuse it with Natrasorb HFB (INCI Aluminum Starch Octenylsuccinate (and) Acrylates Copolymer (and) Magnesium Carbonate), which serves the same function.
It's quite a fascinating process to see the way it absorbs oils! I measure out between 3% to 5% for my bath bombs and after adding up to 5% fragrance oil, it looks as if nothing had happened, except this really fluffy white powder now smells really great! I love to use it in my dry shampoo at 3% to 1% fragrance oil to make my hair smell nicer. You can use it up to 100% in any product. (Although at 100%, isn't it just a bag of Natrasorb?)
not to use volumetric measurements. If you decided to use 3 ml of this product instead of 3 grams, I don't think the scale would register it!
EPSOM SALTS WITH NATRASORB BATH
96% Epsom salts
3% Natrasorb bath
1% fragrance oil
Measure out 3% Natrasorb bath and pour the 1% fragrance or essential oil into that container. Mix well. Add the Epsom salts. Add a titch of colour - if you're using liquid colours, I mean a drop or two! - and mix well. You're done!
FIZZING BATH SALTS WITH NATRASORB BATH
66% Epsom salts
20% baking soda
10% citric acid
3% Natrasorb bath
1% fragrance oil or essential oil
Follow the instructions above by combining the Natrasorb bath and fragrance/essential oil first, then adding the rest of the ingredients. Only use a titch of colour as any more than that will set off the fizz!
MOISTURIZING BATH POWDER WITH EPSOM SALTS
50% Natrasorb bath
20% carrier oils of choice
29% Epsom salts
1% fragrance or essential oil
In any of these recipes, you can substitute Epsom salts for fine sea salts, but DO NOT use Dead Sea Salts in its place as it is really hygroscopic and will turn the product into a brick of fragranced loveliness that won't dissolve in the tub!
Join me tomorrow for fun formulating a foaming and moisturizing bath powders with this ingredient and others!