Baking Eggshells for WSC


Howdy All,

I’ve been collecting lots and lots of eggshells for WSC. Too many to fit in a pan (neighbors have been loading me up on their eggshells). Would it work if I crush them up and put them in the oven at 180 for about 2 hours?

Galil Soil Farm
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Best Answer

Yes, the oven will work well. 180 for 2 hours seems appropriate to get rid of the moisture. I think it will have to be a bit warmer to toast out the organic material. Seems to me more like 250 for 2 hours, but this is an energy thing. Don’t want to burn them, and I don’t have any empirical evidence on this as I always use the pan method, but I typically use a low medium heat, which is a bit more than what the textbook calls for, but we did this in Korea under Master Cho’s watch and he nodded in approval of the higher heat, quicker cook time.

When baking in the oven, crushing is not necessary unless it makes sense. When cooking in the pan, crushing is mandatory trying to get the shells 1-2mm in size. I do not recommend powdering them.

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