David Eakin wrote:Well it's black muck but this is more sediment from the San Bernard River. I think it does have a lot of organic matter in it if you can figure out how to get it released. It's also hard as a rock when dry, especially with some roots running through it.
Best way to get rid of organic matter is to burn it. Have you tried making a test brick of it and firing it? It may lighten up considerably once all the organic matter is burnt up. Without the fetid organic matter in it, it may make for much better starting material for a batch of cob.
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