I was browsing through D C Dalgleish’s page of stock tartans on their website
http://www.dcdalgliesh.co.uk/stock.html

There are two colectioins, named Popular Heavyweight (with pictures of 15 oz tartans) and Reproduction Tartans (with pictures of 11 oz tartans).

As you’d expect a number of reproduction (Dalgleish’s word for weathered) clan tartans appear on both pages and look the same: Grant, Kerr, McPherson and Robertson for example.

But something odd seems to have happened to the MacGregor Reproduction.

Here it is at 11 oz http://www.dcdalgliesh.co.uk/tartan_found.rpy?id=107466

And here it is at 15 oz http://www.dcdalgliesh.co.uk/tartan_found.rpy?id=263853

I don’t understand the technicalities of tartan design, the colouring seems to me clearly different (15 oz is much lighter and has black where the 11 oz has grey).

What’s going on here? Or am I just a sassenach with bad eyesight?