The OD green seems to change colour in whatever light it's in .
Same tank airbrushed with the same pot of Olive drab by Vallejo [link=http://cgi.ebay.co.uk/Vallejo-Model-Colour-Acrylic-Paint-889-US-Olive-Drab_W0QQitemZ180206444626QQihZ008QQcategoryZ56363 QQssPageNameZWDVWQQrdZ1QQcmdZViewItem]US Army OD green[/link]