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Chaga, also known as the brown poromyces betula, is a wood rot bacterium that causes white decay of wood. Mainly born in birch, silver birch, alder and other living wood trunk or bark, forming sterility trait block - sclerotium.
The appearance of chaga antler is black and gray, with irregular grooves; The interior is yellow, the surface is deeply cracked and hard. After processing into powder, its color may vary depending on the extraction process and purity, but it is usually light brown to dark brown.