Anandakanda 2.7.45

2.7.45

karṣābhā vaṭikāḥ kāryāḥ kiṃcicchāyāviśoṣitāḥ /
khadirāṅgārasaṃtapte koṣṭhīyantre kṣipetkṣipet //

Pills resembling a karṣa in size should be made and slightly dried in the shade; / one should drop them successively into a hearth furnace heated with khadira charcoal.