Fuller's earth is a type of clay that is used for many different things. Imagine playing with clay dough like you do in school. Fuller's earth looks like that, but it's different because it can suck up water and oils from other things.
Think of a paper towel that you use to wipe up spills. Fuller's earth is just like that paper towel – it soaks up all the yucky stuff and leaves the surface clean and dry.
Fuller's earth is used to make a lot of different things. It's added to soap and shampoo to help clean your skin and hair. It's also used to make cat litter because it can absorb urine and poop.
So, when you see a picture of someone wearing a face mask with the green clay, it might look funny, but that's one thing they're doing with fuller's earth – using it to clean their face and make it smooth and soft.
Overall, fuller's earth is a natural and helpful material that can be used in many different ways to keep things clean and healthy.