its 2007 material safety data sheet, Dial Corp. states that Fels-Naptha can irritate the eyes and, with prolonged exposure, the skin. Fels-Naptha once contained naphtha, a skin and eye irritant. According to the ingredients list on the Fels-Naptha website, it is no longer included in the soap. Instead, it now contains terpene hydrocarbons. See also Zote (soap) List of cleaning products References External links On The History And Use Of Naphtha In Soap – Natalie Ball, Phoenix Press, 2009 Cleaning product brands Soap brands Dial Corporation brands