Nope. Just straight ashes from the wood stove will work. Charcoal ash is actually good for them occasionally as when they eat it, it absorbs toxins in the body. It also contains Vitamin K, Calcium and Magnesium. Wood ashes however are pretty dirty to use, but if you have a fireplace or stove full of them, the dust bath area is a good place to get rid of the ashes.

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