Re: [Histonet] DAB black/brown
If contrast is what you seek, you could always do a DAB, a Vector VIP
(very intense purple), and a methyl green counter stain. There will be
no doubt as to what is what.
>>> Gayle Callis 01/16/07 10:17 AM >>>
Chris van der loos teaches (he is the master of double IHC or any
staining) that using a blue and a red gives far better contrast along
better tinctorial quality. He also teachs that one antibody be detected
with alkaline phosphatase (develop this color first) and the other with
peroxidase although careful requenching of peroxidase from the first
antibody staining can be done.
AEC with Vector Blue is superb although the Vector blue is a bit less
sensitive DAB or AEC, which means that the primary antibody titer with
chromogen may have to increase.
AEC tends to be orange-red in color, and clashes with the brown of DAB
which is what you observed.
A better combination with your DAB would be DAKO's Permanent red which
rich reddish -pink tones that separates much better from the brown DAB
the contrast you need. The joy of Permanent red is the sensitivity,
maybe even more so than AEC so retitering the antibody may be needed.
would not need to enhance the DAB to black with Permanent red.
Gayle Callis HTL, HT, MT(ASCP)
Research Histopathology Supervisor
Veterinary Molecular Biology
Montana State University
Bozeman MT 59717
At 07:06 AM 1/16/2007, you wrote:
>Can anybody help?
>For our IH we're using DAB with Ni chloride to get black color
>for double stains with AEC).
>In the last period however we get also brown coloured stainings and
>one run we get some slides with brown some with black color (very bad
>our double stains).
>We used new DAB, made fresh Ni chloride solution and H2O2 but nothing
>till now...we now even got some slides stained half black half brown...
>This is especially bad for our double stainings (it's very hard to
>distinguish brown from red).
>Where could be the problem?
>Thanks a lot for any suggestions!
>University Clinic of Aachen, Dept. of Nephrology and Immunology,
>30; 52074 Aachen; Germany
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