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I found this post where apparently someone managed to accidentally destain their DAB stained tissues.  Sounds like a bit of triton-X at 4oC over a weekend does the trick: http://www.ihcworld.com/smf/index.php?topic=666.0

-Ben Smith

Benjamin E. Smith, Ph.D.
Samuel Roberts Noble Microscopy Laboratory
Research Scientist, Confocal Facility Manager
University of Oklahoma
Norman, OK 73019
E-mail: [log in to unmask]
Voice   405-325-4391
FAX  405-325-7619
http://www.microscopy.ou.edu/
________________________________________
From: Confocal Microscopy List [[log in to unmask]] on behalf of Michael Schell [[log in to unmask]]
Sent: Wednesday, April 01, 2015 8:47 AM
To: [log in to unmask]
Subject: Re: Removing DAB IHC staining

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The only thing I know that works for this is fish.  Some breeds of tiny fish find the DAB precipitate to be quite the delicacy.  Fill your Coplin jar with the purest triple-distilled water, then add fish.  You need the type used in toe salons.  It will take a while, so be sure to change the fish frequently.  The fish must be very hungry for this to work.


> On Apr 1, 2015, at 1:08 AM, Paul Rigby <[log in to unmask]> wrote:
>
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> To join, leave or search the confocal microscopy listserv, go to:
> http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> Post images on http://www.imgur.com and include the link in your posting.
> *****
>
> Hi All,
> One of our users has had a mishap with some very precious tumour sections which were accidentally stained with the wrong primary antibody followed by DAB. They want to know if it is possible to destain the sections (remove the DAB, which is, apparently, quite dark). They have experience removing immunofluorescence antibody staining but not the DAB product.
> All suggests will be very gratefully accepted.
> Many thanks
> Paul
>
> Assoc. Prof. Paul Rigby
> Optical Microscopy Specialist
> Centre for Microscopy, Characterisation & Analysis (M510)
> The University of Western Australia
> 35 Stirling Highway
> Crawley  WA  6007
> Australia