Charak Samhita
द्विवर्गार्धांशकल्केन तद्वत् साध्यं घृतं पुनः। शङ्खिनीसप्तलाधात्रीकषाये साधयेद्घृतम् ॥१५॥
Ghrita may also be prepared with decoction of saptala, shankhini & amalaki and again processed with paired drugs.
english translation
dvivargArdhAMzakalkena tadvat sAdhyaM ghRtaM punaH। zaGkhinIsaptalAdhAtrIkaSAye sAdhayedghRtam ॥15॥
hk transliteration by Sanscript