Re: salt printing questions

From: Richard Knoppow ^lt;[email protected]>
Date: 10/22/05-04:16:13 PM Z
Message-id: <019b01c5d756$3926ca90$55fa5142@VALUED20606295>

----- Original Message -----
From: "Joe Smigiel" <>
To: <>
Sent: Saturday, October 22, 2005 2:26 PM
Subject: Re: salt printing questions

>>>> 10/21/05 9:41 AM >>>
>>>...How do you clean silver nitrate stains off your
> sink/bathtub/hands?...<<
> Hi Chris,
> Although I can't remember the source, I read somewhere
> last week that
> silver nitrate stains could be removed removed from
> surfaces using a
> solution of sodium bisulfite. No solution strength was
> specified. I
> remember this because I have some sodium and potassium
> metabisulfite
> around and thought I'd give it a try since bisulfites have
> been
> discussed on this list in the past as a substitute for
> those two
> chemicals in reference to being used as a clearing agent
> of chromium
> stains in the gum bichromate process.
> Some of the old wetplate collodion books nonchalantly
> recommend removing
> silver nitrate stains from hands using a solution of the
> *extremely
> lethal* potassium cyanide fixing agent. Warning Will
> Robinson!
> Warning!!! From pre-OSHA times I quote Ellis ("The
> Photographic
> Instructor",1856, p. 13): "The nitrate of Silver Solution
> will stain the
> hands quite black when exposed to the light, but the
> stains may be
> easily removed by rubbing the spots with Cyanide of
> Potassium while the
> hands are wet, and afterwards wash in pure water." I
> wonder how many
> wetplate photographers dropped dead from doing so?
> Definitely not
> recommended! A situation where I'd prefer to live with
> the stain. (sic)
> A couple weeks ago after doing some wetplate I ended up
> with so much
> silver nitrate on my hands that they turned black and had
> a metallic
> shine to them. It wore off completely in about ten days,
> but until it
> did I got the oddest looks from store clerks whenever I
> went to pay them
> and receive change. I have found that cleaning glass
> plates with a
> whiting (calcium carbonate) and Everclear solution hastens
> the removal
> of the nitrate stains, I assume largely due to fine
> abrasion of the
> skin.
> Joe
   Kodak's old formula for a hand cleaner is:

Kodak S-5 Hand Stain Remover
Solution No.1
Potassium Permanganate 7.5 grams
Water 1.0 liter

Solution No.2
Sodium Bisulfite 480.0 grams
Water 1.0 liter

Rub the hands with a small amount of the No.1 solution,
rinse in water; thn rinse with the No.2 solution which will
remove the stains.

  This is meant for developer and silver stains.

Richard Knoppow
Los Angeles, CA, USA 
Received on Sat Oct 22 16:16:30 2005

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