Knowing my family and their ability to meld into circumstances that will support the survival of the whole, I agree there may not have been a singular or defining tartan to bind many versatile groups under one banner or Laird. Without the evidence of cloth or portraits, I agree with the speculation on the longevity of an official tartan of the Clan. Yet the Colquhoun survive and are proud of our heritage. Thanks for your opinion and observations figheadair.