Our household recently added a full-sized food processor to the kitchen, after years with a tiny one that we’d been given. Since we now have this for food preparation, I decided I might as well try using it for a bath and body experiment in getting excessively frugal.
I wanted to see how well the oatmeal would remain suspended in water, to replicate the bath. So, I used warm water and a bit of the oatmeal. Again, the packaged bath oatmeal is on the left, with what I made on the right. About 5% to 10% appeared to not get suspended well in the water. A colloidal material, by definition, does not really dissolve, but remains suspended in another material in tiny particles. So, my oatmeal simply wasn’t getting milled finely enough to appear dissolved in the water.