HTK-C009 - Dark Earth - Used until August 1941 on upper surfaces of RAF fighters in Temperate Land Scheme. Later used on RAF bombers
HTK-C016 - Dark Green - Used on upper surfaces in camouflage schemes of RAF fighters and bombers from mid-1930s till end of WW2, including in Temperate Land Scheme
HTK-C026 - Sky "Type S" - Used for lower surfaces of Fighter Command aircraft from May 1940 until August 1941. Also used on fighter-bombers