if it seems like clay, then it has absorbed moistiure either out of the air or was given a bath or something to that effect.
as an alternitive to baking and serving it up with a nice lemon garnish, keep it stored in a piece of tupperware with one of those little cappsule things they tell you not to eat thats in pill bottles or those bags of beans in packaging. i think its called silca or something? anyway, that stuff is designed to draw moisture out of stuff and works really well.
and fyi. masters and triangle are both made by tweeten, silver cup is its own company and blue diamond by longoni.