[Harmless Teddy Bear]

Grind shells to a powder (food processor, blender, whatever you have that will work)

Just a tip for those starting out with this, either use a glass container or a plastic one you do not care about.

The egg shells will tear up the plastic inside of what ever you use.

[Qiviut]

Thanks - didn’t know they were ‘death’ on plastic! My blender is glass.