RIF in fact stood for Reichsstelle für industrielle Fettversorgung ("National Center for Industrial Fat Provisioning", the German government agency responsible for wartime production and distribution of soap and washing products). RIF soap was a poor quality substitute product that contained no fat at all, human or otherwise.[12] Rumors about the origins and meaning of "RIF" soap extended into the concentration camps themselves. Naphtali Karchmer, in his book Solitary in the Overwhelming Turbulence: Five Years as Prisoner-of-War in East Prussia, describes his years in captivity as a Jewish-Polish POW.