श्यावो नीलश्चाप्राप्तकः ॥ कZ_०२.१३.२७ ॥
śyāvo nīlaś cāprāptakaḥ
यदि वह गहरा भूरा या नीला-सा हो, तो वह ग्राह्य नहीं है।
It means the treasury/mint should not accept such metal as standard bullion—preventing loss from impure or debased gold.