Charak Samhita
भागं तं दशमूलस्य पुनः क्वाथेन भावयेत्। शुष्कं चूर्णं पुनः कृत्वा तत ऊर्ध्वं प्रयोजयेत्॥५॥
This filtered liquid is used for triturating remaining one part of powdered tilvaka. After completion of trituration with lodhra decoction it is further given trituration of dashamoola decoction. This is then dried and made into powder again and used as per need.
english translation