Thanks mom-6 (you got six children? I had 4).
The poly blend is maroon and has this neat gold thread running through it making this really nice effect.
They were curtains and were only washed two or three times and have faded, but the brand new offcut I've found that is much larger than the curtains is bright and brilliant. I'm just about to hang it out to dry after pre washing and I hope hasn't lost its colour.
Another thing, with this large offcut there is no selvedge - strange. So I'll have to work out the direction of the grain I suppose.