Plain red tracer woven cotton tapes are used to wrap armatures, field coils, field coil supports and transformer windings. They are also used to wrap cables, in electrical appliances and as a sacrificial item in resin or shellac coating processes. - Despite the introduction of revolutionary manmade fabrics, plain cotton is still used in large quantities for electrical insulation. Carolina red tracer woven cotton tapes are sacrificial tape in resin or shellac coating processes.