Green PAP stains?

Would anyone have a guess why pap stains would start turning green?  We were halfway through a bottle of our EA 50 (Harleco supplies) when suddenly a few of our batches of paps (different days) started turning green.  Thanks for any thoughts/help.

** Are paps pH dependent in any way?

Deb King, HT (ASCP)
Sacramento, CA

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