Thanks Linda. I looked on the internet it seems that I should order these locally. None of the big distributor, like Sax's or Triarco, sell them, right?
I do have the vent under my kiln. Many of the reds came out fine. But some, probably because of their location in the kiln or the other glazes around them, came out too dark. Also, I had trouble with the terra cotta (amaco) disappearing in spots!