non-specific staining (Martha Ward)

Martha Ward writes:

We are experiencing non-specific staining on our negative control slides
in some cases where we must use EDTA, pH 8 for our antigen retrieval
solution.  We do not see this with every tissue and I haven't been able
to pin down exactly why it is happening.  We use a Ventana ES for our
staining and I was wondering if anyone has experienced this and what can
I do to eliminate it.  Thanks in 

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