Astanga Hrudaya
सबाष्पैश्च यदोत्तिष्ठेद्बुद्बुदैर्लेहवद्धनः। अवतार्य तदा शीतो यवराशावयोमये॥१९॥
When it gets cooled, it should be transferred into an iron vessel which is kept concealed in a heap of barley for some days. This is the mode of preparing the alkali of medium potency.
english translation
sabASpaizca yadottiSThedbudbudairlehavaddhanaH। avatArya tadA zIto yavarAzAvayomaye॥19॥
hk transliteration by Sanscript