प्रथमनेजने चतुर्भागः क्षयः द्वितीये पञ्चभागः ॥ कZ_०४.१.२३ ॥
prathamanejane caturbhāgaḥ kṣayaḥ dvitīye pañcabhāgaḥ
At the first washing/cleansing, the allowable loss is one-fourth; at the second, one-fifth.
To distinguish natural process loss from deliberate pilferage or adulteration, enabling enforceable accountability for handlers.