It was claimed that the official Morrison clan tartan was recorded by Lord Lyon on 3rd January 1968, from a piece of tartan found in an old Morrison family bible. The bible contained a hand written reference to the tartan and was dated 1747, one year after the proscription of Highland dress. The discovery was made during the demolition of a Black House on Lewis in 1935. Lord Lyon was convinced that it represented the most authentic pattern of what the Morrisons wore in those days and he based the new tartan on the relic.