'Spike' the 'nard'??

Are all azulenes blue? Anyone heard of blue spikenard? My reference books and distiller documentation describe spikenard (nardostachys jatamansi, nepal) as a pale yellow to amber coloured liquid. The principal components are the azulenes gurjunene (not blue), patchoulene (not blue). So maybe green, brown, amber, yellow but not blue? To get blue spikenard I think someone has to 'spike' the 'nard' with azulene?     


Ian Brealey