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My invention is the mixture, but if fired at 850 C° any clay should serve the purpose. To test if it is limefree, use vinegar. If bubbles come up its not good for most carnivores. With enough holes in the bottom you could try to use epiweb http://www.epiweb.se/products.htm. Only the moss outside will take longer if it is fired higher for a stronger material. The structure outside I do with a ordinary pastry fork. Maybe I will do soon some Youtube film to show what I mean, if there is demand.But I am sure, you will discover many new ways to do it.