Related for Bava Metzia 110:8

ומי מחללינן כסף על נחושת והא תנן סלע של מעשר שני ושל חולין שנתערבו מביא בסלע מעות ואומר כל מקום שישנה סלע של מעשר שני מחוללת על מעות הללו ובורר את היפה שבהן ומחללו עליה

But according to R. Meir, [merely] because he did not declare to her, 'It was written in my presence and signed in my presence,' he must divorce her, and the child is a bastard! — Even so: R. Meir is consistent with his view. For R. Hamnuna said on 'Ulla's authority: R. Meir used to say, Whenever one departs from the fixed procedure ordained by the Sages<span class="x" onmousemove="('comment',' Lit., 'from the coin struck by the Sages.' ');">¹³</span> in case of divorce, he [her next husband] must give a divorce, whilst the offspring is a bastard. R. Shesheth objected: It [sc. the second tithe <i>demai</i>] is redeemed [by exchanging] silver for silver, copper for copper, silver for copper and copper for produce;<span class="x" onmousemove="('comment',' In each case the former of the pair is redeemed by the latter. Hence the last clause means that in the case of demai copper coins may be redeemed outside Jerusalem by substituting produce (not of the second tithe) for them, which produce in turn becomes sanctified. ');">¹⁴</span> then he may redeem the produce: this is R. Meir's opinion. But the Sages say: He must carry the produce to Jerusalem and eat it there.<span class="x" onmousemove="('comment',' Dem. II, 6. The translation follows Tosaf. R. Meir permits the produce to be redeemed, though that itself was formerly employed for redeeming the money; whilst the Sages maintain that in these circumstances the produce itself must be taken to Jerusalem. Hence R. Meir is more lenient here in respect to demai than the Sages, which contradicts Samuel's assertion above that in this R. Meir is particularly stringent (more so than the Rabbis). ');">¹⁵</span> Now, is it permissible to redeem silver with copper?<span class="x" onmousemove="('comment',' According to Tosaf., this is adduced to shew further that R. Meir is more lenient than the Sages. In Rashi's view, however, this is part of the reasoning leading up to R. Shesheth's objection. ');">¹⁶</span> Surely we learnt: If a <i>sela'</i> of the second tithe was intermixed with one of <i>hullin</i>,<span class="x" onmousemove="('comment',' And the owner wishes to spend the hullin money outside of Jerusalem. ');">¹⁷</span> he brings a sela''s worth of copper coins and declares: 'Wherever the <i>sela'</i> of the second tithe may be, it is redeemed with these coins.' Then he selects the best of them<span class="x" onmousemove="('comment',' I.e., the best sela' of the two; these are now both hullin. ');">¹⁸</span> and redeems them [the copper coins] therewith;<span class="x" onmousemove="('comment',' With the finer sela' which now becomes second tithe. ');">¹⁹</span>

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