Reference for Bava Batra 327:11

ולישהייה אמר רבי ירמיה חיישינן לב"ד טועין:

[has been said in the case only] where the witnesses are signed on an erasure.<span class="x" onmousemove="('comment',' Since the two kinds of erasure appear side by side, on the same document, the contrast between them would be noticed. ');">²⁹</span> Where, [however], the witnesses are not signed on an erasure but on [clean] paper [the difference<span class="x" onmousemove="('comment',' Between a first, and second erasure. ');">³⁰</span> can] not be detected.<span class="x" onmousemove="('comment',' The contrast on the document being not that between two kinds of erasure but between an erasure and clean paper. ');">³¹</span>

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