This special Debbie Mumm "Mumms the Word" for SSI is the most brilliant purple I've ever seen and i've taken care to attempt to represent the color correctly in my two photos.  What you may not be able to see is the tiny crosshatching black lines that form its own pattern.  It is my understanding that most Debbie Mumm fabrics are 100% cotton. Prewashed. 

I have 6 yards (44 inches) to sell of this vintage fabric at $8.00 per yard.