Substitutes include １． Co-precipitated colorants of titanium oxide and organic colorants ２． Organic colorants with a high level of concealment ３． Bismuth vanadate colorants or joint bismuth vanadate and organic colorant Implementation of an adsorption enrichment catalytic deodorizing system has proved effective in removing volatile hydrocarbons (VOC) from exhaust gases, preventing atmospheric pollution and creating a better work environment.