There is no need for complicated pot-raising procedures. Fill it with boiling water first, but don't spill it and burn your hands. Let it cool, then change it three times in a row. Just remove the harmful substances from it by expanding with heat and contracting with cold.

The purple sand cup, which is made entirely of purple sand, can also be raised to the so-called dark state on the surface by ordinary pot-raising techniques. It's beautiful and complicated.