Pyrolysis oil and syngas are products of pyrolysis and gasification processes respectively. The carbonization conversion typically occurs through pyrolysis or destructive distillation. The first process used was the carbonization and partial pyrolysis of coal. Biochar is charcoal created by pyrolysis of biomass waste. Direct processes are based on approaches such as carbonization, pyrolysis, and hydrogenation. Syngas is usually produced by pyrolysis. Soot is produced by laser ablation of graphite or pyrolysis of aromatic hydrocarbons. Extreme pyrolysis, which leaves mostly carbon as the residue, is called carbonization. Alternatively, soot is produced by laser ablation of graphite or pyrolysis of aromatic hydrocarbons. Hydrothermal liquefaction is a process similar to pyrolysis that can process wet materials. Slow pyrolysis produces gases and solid charcoal. Biochar is the residue of incomplete organic pyrolysis, e.g., from cooking fires. Phenol is also a recoverable byproduct of coal pyrolysis. In order to isolate noble-metalliferous materials, pyrolysis and/or hydrolysis procedures are used. Feedstocks and output are the same as for pyrolysis.