Tip: Bake Clay for Your Cosmetics

A lot of people have asked me about using clay in cosmetics as of late.
'Is it safe to add to an emulsion?'
'I've heard clays wreak havoc on preservatives'
'How do I know if my clay is OK?'

Well here's some good news.

I just came across a super duper easy tip to help clear your clay of every last bit of moisture, kill off any resident beasties, and prep the powder for use in skincare products.

Shall we adjourn to the kitchen?

To Clean Your Clay, You'll Need

  • Clay
  • Sanitary Baking Tray
  • Oven
  • Sanitary Container


  1. Spread your clay out evenly on the baking tray in a thin layer to ensure even heating throughout the process
  2. Set your oven at 212º F / 100º C
  3. Place the tray in the oven for at least 15 minutes. (This will remove any moisture)
  4. Turn the oven up to 320º F / 160º C and let the clay bake for a minimum of 2 hours
  5. Decant the clay into a sanitary container until ready for use (Allow the clay to cool completely before closing the container to avoid condensation)
  6. Rejoice

A Little Heads Up

This method will NOT magically transform any old type of clay into suitable use for cosmetics. Be sure you are using COSMETICS GRADE any time you want to add clay to a skin or haircare product. There is a reason cosmetics grade costs more than other grades (often sold for a fraction of the cost). Cosmetics grade clay is handled and processed specifically for use in cosmetics.


This clay-cleaning tip comes to you courtesy of Rebecca Midkiff at DIY Cosmetics. Her source for this method is Martindale Pharmacopoeia. Find Rebecca's original post (and the inspiration for todays post) right here.

Do Tell

Have you ever baked your clay? Please share in a comment below.

More Cool Stuff About Clays and Microbes

Clay mineral as antibacterial agents
Physical and chemical characterization and method for decontamination of clays for cosmetics


Rebekah Osorio said…
Clay is one of my favorite things to work with. Thank you so much for this tip!! This will save me so much hassle :) :)
Lise M Andersen said…
Hi Rebekah - I was wuite pleased to come across this tip too
Thanks for sharing Lise
Lise M Andersen said…
Hi Annette - my pleasure!
Leslie Dimond said…
Hey Lise, Wouldn't you have to heat the clay above 100 C to drive off any water? BTW, I really love your blog! Leslie
Lise M Andersen said…
HI Leslie - Thanks for your kind comment! I agree it sounds like one might benefit from a higher temp, but I am citing the original source with this method, so I am assuming it has been tested and verified.
Justine Akçor said…
Exactly what I was looking for. Thanks!
I am just wondering if we could use a microwave for small amounts...
Lise M Andersen said…
Hi Justine - That’s a great question. Unless you know the exact temperature of your microwave I’m not sure this is recommenable. However, I would need to do a bit of checking to be sure. The time factor is as important as the temperature so I think I would stick to a regular oven.
Justine Akçor said…
Yeah, that is the part where I also get a huge question mark. I am just thinking that you can sterilize baby bottles in the microwave and I also just found an article about at home sterilization with a microwave for urinary catheters ... https://www.ncbi.nlm.nih.gov/pubmed/2908961
This might be worth further research...
Lise M Andersen said…
HI Justine - Oh wow thanks for sharing this link! That is quite interesting indeed! Perhaps you've hit upon something new with this thought. Of course, there is no way of knowing if a microwave method would work unless you have access to test equipment, but the idea is certainly intriguing! Thanks again for sharing the link.