משנה על נדרים 6:1

If a man bought [grain from an am haaretz] to be used for seed or for animal [feed], flour for hides, oil for a lamp, or oil for greasing utensils, it is exempt from [the rules of] demai. [Produce grown] beyond Cheziv and north is exempt from [the rules of] demai. The hallah of an am haaretz, produce mixed with terumah, produce bought with second tithe money, and the leftovers of minhah offerings are exempt from [the rules of] demai. Oil spiced [with spices from an am haaretz]: Bet Shammai makes it liable [to the rules of demai]. But Bet Hillel exempts it.

Unclean fish which was pickled with clean fish:If the jug contains two seahs and the unclean fish weighs ten zuz in Judean measure, which is five selas in Galilean measure, the brine is forbidden. Rabbi Judah says: it needs be a quarter [of a log] in two seahs. Rabbi Yose says: one-sixteenth of it.