Tools and techniques for biochar method, systems, devices, and products are provided in accordance with various embodiments. For example, methods are provided in accordance with various embodiments that may include rubbing one or more objects with biochar. Rubbing the one or more objects with biochar may include: polishing one or more objects utilizing biochar; cleaning one or more objects utilizing biochar; grinding one or more objects utilizing biochar; scratching one or more objects utilizing biochar; and/or abrading one or more objects utilizing biochar. In some embodiments, polishing the one or more objects utilizing the biochar includes: combining water, the biochar, and the one or more objects; and/or tumbling the combined water, biochar, and one or more objects. The one or more objects may include one or more stones. The tumbling may occur for 72 hours or less. The tumbling may occur as a single step.
