Anandakanda 2.1.52

2.1.52

tāpasphoṭāṅgasaṃkocaṃ haritālamaśodhitam /
<haritālaśuddhiḥ; prathamaḥ prakāraḥ>
tālakaṃ kaṇaśaḥ kṛtvā daśāṃśena tu ṭaṅkaṇam //

and brings about fever, eruptions, and contraction of limbs—such is unpurified orpiment.
[Purification of orpiment; first method:]
Having broken orpiment into small grains, one should wash it with borax [amounting to] a tenth part,