It came out a medium blue on the under layer and didn't take at all anywhere else!
So clearly, it's not just plain cotton, I think it's a polyester blend but I can't be sure, the label doesn't specify what the underlayer is made from...

I used Dylon Wash & Dye in Velvet Black
It was previously a light grey
I'm kiiiinda hoping I might be able to draw some of the dye out and get it back to a grey colour, but I'm unsure of how to go about it
is it possible?
any ideas?