Peter, we still order the Ivorite from the same company...it has changed over the years with some variations working better than others...some had "specks" of dirt we deemed unacceptable, others simply had cracks or lines that rendered the materials useless for our applications...
That being said, I'm not sure the top one is Ivorite...looks more like Alternate Ivory, but w/o having it hand I couldn't say for sure...
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Scott
RKS #014
HE IS RISEN!, HE IS RISEN INDEED!