Tosefta for Pesachim 90:7
פשיטא מהו דתימא זמנא דאטיף ומטי להתם קא משמע לן
Now, since R'Simeon B'Eleazar said, 'He has nullified it', it follows that the fi Tanna holds that he has not nullified it. This proves that he holds, wherever there is as much as an olive, even if he nullifies it, it is not nullified.
Tosefta Pesachim
Tanners' bowls into which flour is placed [as part of the tanning process (see Pes. 45b:19)], [if the flour was placed there less than] three days before Passover, behold, he needs to remove [the flour]. Others say, once he placed hides inside [the bowl], there is no need to remove it [since the flour is no longer edible]. An eye salve (קִילּוּר not קלור, see Minchat Bikkurim) or a compress or a plaster into which flour is mixed, there is no need to remove it. A poultice [containing flour] that became putrid, there is no need to remove it. The chamasit (=חמסית, a mustard-like plant, see Minchat Bikkurim; alt., חרוסת (charoset), see GR"A) into which flour is mixed, behold, it is forbidden. Loaves [made from leavened] dough that became moldy or that dried out, behold, they are forbidden.
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