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Biochar is a fairly common label used to identify the by-product from the gasification of carbonaceous materials like wood chips or grasses. It is a solid odorless powder that has a gray/black or black/ tan color depending on the process and original carbonaceous material. This by-product has some characteristics that require safety precautions while storing, handling, and applying.
Agriculture | Bioresource and Agricultural Engineering | Oil, Gas, and Energy
Schwab, Charles V. and Hanna, H. Mark, "Master Gardeners’ safety precautions for handling, applying, and storing biochar" (2012). Agricultural and Biosystems Engineering Extension and Outreach Publications. 5.