Anandakanda 1.6.118

1.6.118

medovedhena śulbaṃ tu svarṇaṃ syādasthivedhataḥ /
rūpyaṃ svarṇaṃ bhavenmajjavedhāllohāni kāṃcanam //

By transmutation of fat, copper becomes gold; by transmutation of bone, / silver becomes gold; by transmutation of marrow, base metals become gold;