カリガラス

noun

potash glass; Kaliglas

A type of glass made with potash (potassium carbonate) instead of soda; a technical term in glassmaking.

from Dutch

• カリガラスは、ソーダガラスよりも硬かたくて透とう明めい度どが高たかい。

  Potash glass is harder and more transparent than soda glass.