"Who says you can't machine-wash-and-dry a rug you've made?! Columbia-Minerva says you can and should...to keep it lovely and lively longer...just as long as you've made it of the one-and-only Columbia-Minerva Washable Rug Yarn. It's made of 100% Acrylic and absolutely sensational for other practical projects such as bikinis and bags...slippers and sweaters... and more. Great idea for the way you live today!"
Columbia-Minerva rug yarn ad 1972
This is one to click and enlarge.