गोशीर्षकं कालताम्रं मत्स्यगन्धि ॥ कZ_०२.११.४४ ॥
gośīrṣakaṃ kālatāmraṃ matsyagandhi
(चन्दनभेदाः) गोशीर्षकं, कालताम्रं, मत्स्यगन्धि (च)।
Because the state needs to recognize and classify all trade-circulating varieties, including lower-grade stock, for pricing and tax purposes.
They limit discretionary appraisal by giving shared, checkable criteria for categorizing consignments.