Opaline was not a catalog color. There was a run of these in 2006 and I only purchased one. There was at least a dozen of them sitting on the sales table in the visitors center and I only purchasd one. I have not seen any offered for sale in all of the years since. (Did I mention that I only purchased ONE?) Blenko did make some petal bowls from this color and probably some other utiltarian pieces. These are out there somewhere so keep your eyes open.