Shiva Purana
लोकाग्निजमथो भस्मद्र व्यशुद्ध्यर्थमावहेत् । मृद्दारुलोहरूपाणां धान्यानां च तथैव च ५८ ।
The ash derived from ordinary fire shall be used for the purification of articles of mud, wood or metals and even for grains.
english translation
lokAgnijamatho bhasmadra vyazuddhyarthamAvahet । mRddAruloharUpANAM dhAnyAnAM ca tathaiva ca 58 ।
hk transliteration by Sanscript