Significance of white in a tartan

[Tomo]

[QUOTE=OC Richard;1407930It would be instructive for all tartan aficionados for somebody to go colour-by-colour...[/QUOTE]

I think we are going to need need some fairly complex Venn diagrams...

This little gem is from the BBC - Today, the colours identify religion as red and green tartans represent Catholics and the blue represents Protestants. The divide is important in Scotland as one can identify people's religion by what colour tartan is worn.