TheresidualcarbonofKang'sresidueisthecarbonresidue measuredbyConradXun'scarbonresiduetester.Oilunder specifiedtestconditions, Becauseoftheheatevaporation,theresidualcarbonresidue aftercombustioniscalledchar.Themagnitudeoftheresidual carbonandtherefiningdepthoftheoil Relatingtothedegreeofmetamorphismintheprocess. Sulfate...