Reference for Bava Kamma 204:3

הא ר"מ דאמר שינוי קונה והא רבי יהודה דאמר שינוי אינו קונה

[Why this difference of opinion?] — Said R. Johanan: There is no difficulty, as one<span class="x" onmousemove="('comment',' I.e., the former Baraitha. ');">⁴</span> was in accordance with R. Meir and the other with R. Judah; the former was in accordance with R. Meir who said<span class="x" onmousemove="('comment',' In the case of wool given to a dyer to dye red and he dyed it black, as supra p. 586. ');">⁵</span>

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