ततः शुल्बकाकण्युत्तरापसारिता आचतुःसीमान्तादिति षोडश वर्णकाः ॥ कZ_०२.१३.१६ ॥
tataḥ śulbakākaṇyuttarāpasāritā ācatuḥsīmāntāditi ṣoḍaśa varṇakāḥ
Thereafter are the gradations called: ‘from the copper-standard up to the kākaṇī-standard’, and ‘from (that) onward up to the four-boundary limit’—thus, sixteen colour/assay grades (varṇaka-s) are recognized.
To create enforceable quality categories for inspection, pricing, taxation, and prosecution of adulteration in gold transactions.
They function as standardized reference points so state officers and merchants can align valuation and detect manipulation.