Charak Samhita
तीक्ष्णायसस्य पत्राणि वह्निवर्णानि साधयेत् । चतुरङ्गुलदीर्घाणि तिलोत्सेधतनूनि च ॥१६॥
Then they should be dipped in triphala decoction, cow urine, alkali prepared from lavana, ingudi and palasha.
english translation
tIkSNAyasasya patrANi vahnivarNAni sAdhayet । caturaGguladIrghANi tilotsedhatanUni ca ॥16॥
hk transliteration by Sanscript