Amorphous Carbon

Amorphous carbon, as usually met with, contains a variable proportion of impurity derived from the organic compounds or natural products from which it is prepared. Sugar-charcoal, lampblack, soot, gas- carbon, vegetable and animal charcoal, and coke are reckoned as forms of amorphous carbon. The impurities present within them may be "organic," i.e. may consist of compounds of hydrogen, oxygen, and nitrogen, which ignition has failed to remove; or inorganic, which will remain as ash when the carbon has been burned away.