APPLICATIONS: Thiourea is used directly in ore filtering,metal refinery and cleaning,isomerization catalyst (conversion of maleic to fumaric acid)and as an additive in fertilizers(to inhibit the nitrification process),drilling auxiliaries,light-sensitive photocopy paper and explosives.It is used as a fixing agent in photography,as a liquefying agent in animal hide glue,as an insecticide,as a textile-treating agent,and as an intermediate to produce other compounds,etc.