Tevul Yom 3:6-4:1

T’vul Yom 3:6

If a ritually clean person chewed food and it fell on his clothes and on a trumah loaf, the loaf is not rendered susceptible to ritual impurity. If he ate crushed olives or moist dates with the intention to suck the pit, and it fell on his clothes and on a trumah loaf, the loaf is rendered susceptible to ritual impurity. If he ate dried olives or dried figs and his intention wasn’t to suck the pit, which fell on his clothes and on a trumah loaf, the loaf is not rendered susceptible to ritual impurity regardless of whether he was ritually clean or a t’vul yom. Rabbi Meir says that in either case (i.e., moist or dried fruit) it’s rendered susceptible to ritual impurity when a t’vul yom was eating because liquids that come out of a ritually unclean person render things susceptible to impurity whether one desires it or not. The Sages say that a t’vul yom isn’t considered ritually unclean.

T’vul Yom 4:1

If a food of maaser (tithes) was rendered susceptible to ritual impurity by a liquid and then touched by a t’vul yom or a person with unwashed hands, trumas maaser (the trumah taken from tithes) may still be taken from it in a state of purity. This is because it only has third-degree impurity, which is considered ritually clean when it comes to chulin.