श्यावो नीलश्चाप्राप्तकः ॥ कZ_०२.१३.२७ ॥
śyāvo nīlaś cāprāptakaḥ
Si es de color marrón oscuro o azulado, es inaceptable (no debe recibirse).
It means the treasury/mint should not accept such metal as standard bullion—preventing loss from impure or debased gold.