काकमोचकः कपोतरोचनावर्णः श्वेतराजिनद्धो वा विस्रः सीसधातुः ॥ कZ_०२.१२.१३ ॥
kākamocakaḥ kapotarocanāvarṇaḥ śvetarājinaddho vā visraḥ sīsadhātuḥ
Lead ore/metal is ‘kākamocaka’, of the color of pigeon-rocanā, or marked with white streaks; it has a foul odor.
Low-cost sensory QA: color, streaking, and smell are used as field diagnostics before committing state transport and smelting capacity.