"it reeks as ever of carbolic, pus, and sweat"
Bar of carbolic soap
Creative Commons Attribution Share AlikeBar of carbolic soap - Credit: SamBlob

Carbolic soap is a disinfectant soap made from carbolic acid, which is extracted from coal tar.  The soap has a distinct bright red color and was used worldwide during much of the twentieth century.  

Because of its anti-bacterial properties, the soap was used in operating rooms and hospitals, and as a deodorant.  For these reasons, it was commonly used during World War I.