tantech holdings ltd. develops and manufactures bamboo-based charcoal products for industrial energy, household cooking, heating, purification, agricultural, and cleaning applications in the people's republic of china and internationally. the company operates in three segments: consumer products, trading, and electric vehicle. it provides pressed and formed charcoal briquettes for use in grills, incense burners, and other applications under the algold brand. the company also offers charcoal doctor branded products, such as air purifiers and humidifiers, automotive accessories for air purification, underfloor humidity control products, pillows and mattresses, wardrobe deodorizers, mouse pads and wrist mats, refrigerator deodorants, charcoal toilet cleaner disks, liquid charcoal cleaners, shoe insoles, and decorative charcoal gifts. in addition, it provides bamboo vinegar, a liquid byproduct for use in disinfectants, detergents, lotions, specialized soaps, toilet cleaners, and fertilizer