[pure-silver] Re: IPI toner. Silverlock?
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sun, 11 Sep 2005 18:56:51 -0700
----- Original Message -----
From: "Nick Zentena" <zentena@xxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Sunday, September 11, 2005 8:09 AM
Subject: [pure-silver] Re: IPI toner. Silverlock?
On Sunday 11 September 2005 08:59, Richard Knoppow wrote:
I have A formula but it seems to me that IPI has
revised it at least
once. The IPI formula was intended for toning microfilm
and to have low
odor and relatively high capacity. The main reason IPI
chose to publish a
formula was to avoid being dependent on a commercial
products which might
be changed. T-8 will work for both image protection and
toning. I will find
and post the IPI formula later today.
Thanks Richard. What's the keeping qualities of mixed T-8?
Nick
For some reason I remembered the forula and method of
mixing the IPI toner as being complicated. Perhaps due to
the extensive discussion of the toner. The following is what
I have.
IPI Polysulfide Toner Concentrate
Solid Liver of Sulfur 495.0 grams
Deionized water to 1.0 liter
When mixed add Borax 20.0 grams
For use do not dilute beyond 1 part concentrate to 25 parts
water.
Discard if the mixture developes signs of decomposition such
as a strong odor or a scum.
The IPI report does not specify a temperature for toning.
T-8 and Kodak Brown Toner are slow at room temperature but
this formula may be different, one must experiment.
For comparison here is Kodak T-8
Kodak Polysulfide Toner T-8
Water 750.0 ml
Liver of Sulfur 7.5 grams
Sodium carbonate, monohydrated 2.5 grams
Water to make 1.0 liter
Use full strength. Time for toning is about 15 to 20 minutes
at 68F or about 3 to 4 minutes at 100F.
According to the discussion in the IPI report to the
National Institute for the Humanities the concentration of
the original concentrate is important in assuring toning of
all densities at equal rates. However, Dr. Nishimura, in a
personal communication, stated that T-8 worked for image
protection as well as color change.
The lower pH of the IPI toner is stated to reduce odor.
It is also stated that it produces a higher conversion of
silver to silver sulfide than either Kodak Brown Toner or
Kodak T-8
It is important that films or papers to be toned by
washed enough before toning to remove acid fixer from them.
Carried over acid can cause accelerated decomposition of the
toner.
The IPI paper does not mention the use of a sulfite
clearing and "stop" bath after toning. My experience with
KBT and with the combination toner I posted is that if
washing is fast after toning the after bath is probably not
necessary. However, a rinse in stock strength Kodak Hypo
Clearing Agent, which is essentially a 10% solution of
Sodium sulfite, clears the yellow color nearly instantly. A
minute or so in this bath is enough. I have not tried normal
strength KHCA (diluted 1:4) but it may work as well.
A final note: Do not use any sulfiding toner in the
vicinity of unexposed or undeveloped sensitive material. All
produce some Hydrogen sulfide gas (rotten egg odor) which is
a prodigious fogging agent.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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