What does the word potash mean?

Usage examples for potash

  1. Do not handle permanganate of potash in the room where your bleached leaves are drying. – The Book-Hunter at Home by P. B. M. Allan
  2. And when I had handed it in by a chink in the open door, first there was a sound like drinking, then an awful cry, " Potash again!" – HE by Andrew Lang