Vaishnava Dharmashastra 23.48

23.48

nityaṃ śuddhaḥ kāruhastaḥ paṇyaṃ yac ca prasāritam
brāhamaṇāntaritaṃ bhaikṣyam ākarāḥ sarva eva ca //

The hand of a (cook or other) artizan, things exposed for sale in a shop (though they may, have passed through the hands of many customers), food given to a Brâhmana (by other Brâhmanas, or by, Kshatriyas, &c., but not by Sûdras), and all manufactories or mines (of sugar, salt, and the like, but not distilleries of spirituous liquor), are always pure.