Charles,
A handheld light of any kind isn't really suitable because you would have to
hold it over the slides for 15 to 60 minutes, according to which variant of the
von Kossa method you plan to use (see Lillie & Fullmer 1976 Histopathologic
Technic ... 4th ed. pp 539-541).
An anglepoise lamp with an old-fashioned 100W bulb is OK, and so is a sunny
windowsill. Silver salts absorb at the blue end of the spectrum, so a
fluorescent light should be more efficient than an incandescent bulb. If no
bright light source is available, it's possible to chemically reduce the silver
phosphate and/or carbonate to black colloidal silver, with a traditional
photographic developer. The method of Rungby et al.1993 may be better than
other post-reduction methods
(https://scholar.google.ca/scholar?hl=en_sdt=0%2C5=rungby+1993+calcium+deposits=rungby+1993).
I never tried it, but Rungby's paper has collected 104 citations, which is
very good for a paper in our field.
The von Kossa technique is simply explained in my Histological and
Histochemical Methods textbook, 5th edn (2015). The book costs less than 1ml of
any antibody.
Enough said! John
John A. Kiernan
Emeritus, Anatomy & Cell Biology,
University of Western Ontario
London, Canada
https://www.schulich.uwo.ca/anatomy/people/bios/emeriti/kiernan_john.html
Also Secretary, Biological Stain Commission, Inc.
https://biologicalstaincommission.org
= = =
-Original Message-
From: Charles Riley via Histonet
Sent: Wednesday, July 26, 2023 1:23 PM
To: histonet@lists.utsouthwestern.edu
Subject: [Histonet] Von Kossa staining
*** Externally sourced email message ***
Can anyone out there who performs Von Kossa staining provide me with any
guidelines or suggestions for the light source to use for the Silver nitrate
activation?
Is a standard handheld black light strong enough or does it need to be a UV
sanitizing strength light if using UV versus incandescent bulb exposure?
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