its funny that you say this,
Originally Posted by 2F/2F
i have done archival ( HABS/ HAER ) documentations for federal and state
archives for 20 years and the standards do not require selenium toning ..
as you said, it helps, but it isn't necessary ...
good luck tkamiya !
I was asked about Sistan in a PM, so I found something online about it at http://unblinkingeye.com/Articles/Ar.../archival.html. The following paragraphs are probably worth considering in regards to this discussion:
"Other Treatments: Agfa makes a product called Sistan, and Fuji makes a similar product called AG Guard, which is used to treat prints after washing. Thomas Wollstein has corresponded with Agfa regarding Sistan, and tells us that Sistan contains potassium thiocyanate and a wetting agent--it works by converting oxidized silver ions in the emulsion to a stable, insoluble salt. Robert Chapman states that Sistan “...precipitates any silver ion formed by oxidation in the form of silver thiocyanate (AgSCN). Silver Thiocyanate is colorless and virtually light-insensitive.” But Sistan only works as long as the thiocyanate stays in the emulsion, so Agfa recommends that Sistan be used as a final treatment, after washing and before drying--if it is washed out, archival benefits are probably lost.
"According to Doug Nishimura, “before any silver deterioration can occur, silver must be oxidized into silver ion. Even air and moisture can act as a strong enough oxidizing combination to cause damage.” He notes that “...there is always a small amount of ionic silver in equilibrium with silver metal in a photographic image.” But, whether the ionic silver already exists in the emulsion or is caused by pollutants, thiocyanate combines with it, thereby stabilizing it as an inert salt which will not cause image degradation. Sistan is said to be fully compatible with toning treatments. I should note that Dupont 6-T Gold Toner contains potassium thiocyanate, and Kodak GP-1 contains sodium thiocyanate, but I do not know if either is in sufficient quantity to be as effective as Sistan is alleged to be--also, prolonged washing would negate any benefit derived therefrom. Robert Chapman states that, though he has inquired several times, Agfa has not provided him with substantive documentation to prove the effectiveness of Sistan. He allows, however, that “..it makes sense on theoretical grounds.” Other sources on the world-wide-web hint that Sistan may not be effective over the long term, but there is no hard data to back this up either.
"Long Term Stability: Doug Nishimura of RIT’s Image Permanence Institute has emphasized repeatedly that image permanence is tied more to storage conditions than to processing. No matter how carefully processed an image is, if it is subjected to atmospheric pollutants it will be liable to degrade. In a letter to Jennifer Scott of the State Library of South Australia, he tells an anecdote about photographic prints on display in a gallery that suffered deterioration in a matter of weeks in the form of orange spots, which resulted from the fumes produced by a repainting of the gallery walls prior to the exhibit. In a web post he states: '...we find that of the thousands of photographs examined here at IPI, we rarely find deterioration from hypo retention. Virtually all of the fading seen in photographs has been caused by [contaminants in] air and moisture.'"
Of course, this is off of the Internet, so you have to be careful about such claims. Most notably, I don't know who any of the named sources are.
"Truth and love are my law and worship. Form and conscience are my manifestation and guide. Nature and peace are my shelter and companions. Order is my attitude. Beauty and perfection are my attack."
- Rob Tyner (1944 - 1991)
I intend to display some of my own work on walls of my hallway. It will be inside of a regular frame made from archival quality materials. All of my works are double fixed, HCA, and washed for 30 minutes. Some are selenium toned, some aren't, and I'm considering SISTAN per above recommendation. This hallway is lit via natural lighting during the day. I wonder how photographs of different treatment will fare under this condition.
Are there any comparative studies on this?
Develop, stop, fix.... wait.... where's my film?