सुवर्णं पूर्वं निकष्य पश्चाद्वर्णिकां निकषयेत् ॥ कZ_०२.१३.१७ ॥
suvarṇaṃ pūrvaṃ nikaṣya paścād varṇikāṃ nikaṣayet
まず金を試金石にこすりつけ、次に比較のため参照色標(varṇikā)をその上にこすりつける。
It fixes the unknown sample’s streak first, then immediately compares it to a known standard under the same surface conditions—reducing dispute and manipulation.