Yellow Tipping : Incomplete gas combustion where excess hydrocarbons can possibly result in unacceptable levels of carbon monoxide being produced. NOTE: This may result in soot deposition and continual deterioration of combustion
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}