Reference for Chullin 112:14
ריב"ל הויא ליה ההיא תרנגולת שדריה לקמיה דר' אלעזר הקפר בריבי א"ל
There is also a Baraitha that supports this, viz. , With regard to which organs did they state the rule [that if they turned green it was invalid]?
Jastrow
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