A friendly piece of advice...do not open this can of worms again. It is not a "tradeskill" item becuase it is not used in any tradeskill recipes. It's used in a combine in a glaze mortar, which is not a tradeskill container (it does not use any of the tradeskills in the game...it's a no fail combine). The resulting glaze IS a tradeskill item because it's used in pottery combines. Better to just accept that it's not a tradeskill item and just walk away from this. For your entertainment: https://forums.daybreakgames.com/eq/index.php?threads/oil-of-a-frog.265565/