A few years ago, I participated with an online group that did a monthly "block lotto". If we were using black, the rule was to use Kona black so that all the blacks would be the same. I bought my Kona black at JoAnn fabrics. It was terrible. I complained to the group, but they must have thought I was "nuts". I finally sent the part I had left to the manufacturer. They said it wasn't Kona.
bkay