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What is the white stuff in potting soil?

In potting soil they have the little white chunks. What is this? And is it dangerous if my little one is playing in the potting soil and he touches it? He does like to put his fingers in his mouth still, I try to wash them as much as possible, but you know how it is with kids, they are still going to get dirty. I just really need to know if its bad for him.


It is probally ground up newspaper.
Not a bad loose fill insulation material, but try not to breath it in. If you're planning to remove it, have it checked for asbestos first.

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