Crushing eggshells into powdery consistency also allows you to store it in airtight containers so you have instant protein and calcium powder for your pooch. (mypetneedsthat.com)
For powdered coconut sugar I simply put my granulated coconut sugar in my blender and blended until fine powdery consistency. (triedandtasty.com)
They are larger than instant oatmeal, which tends to have a very powdery consistency. (citronlimette.com)