ts or of isotopes: carbon (carbon blacks and other forms of carbon not elsewhere specified or included).: carbon (carbon blacks and other forms of carbon not elsewhere specified or included): other exported by the US in 2013-12 $962,846.00 of HTS Code 2803.00.00.50 ??? inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals,of radioactive elements or of isotope