तस्यारम्भे रागविशेषेषु प्रतिवर्णिकां गृह्णीयात् ॥ कZ_०२.१३.५७ ॥
tasyārambhe rāgaviśeṣeṣu prativarṇikāṃ gṛhṇīyāt
At the outset, for each specific coloring/solution (rāga-viśeṣa), one should take a corresponding color-standard (prativarṇikā) as a reference.
It makes the test reproducible across inspectors and locations, reducing discretion and opportunities for collusion or error.