PMG Winter Meeting – “New Insights into the Composition and Permanence of the Silver-Platinum Satista Paper and the Satista Prints of Paul Strand” by Lisa Barro

Lisa Barro covered new technical information about Satista paper and related topics on preservation of Paul Strand’s Satista prints at The Metropolitan Museum of Art.


At the beginning, Barro introduced Satista paper and informed the audience that the current research is building on the previous research presented at the 2003 PMG Winter Meeting, San Juan, Puerto Rico and published in Topics in Photographic Preservation, Volume 10: Lisa Barro, The Deterioration of Paul Strand’s Satista Prints.


Satista is a silver-platinum paper introduced in 1914. It was a cheaper alternative to platinum, before palladium paper was introduced. The Strand prints on this paper at the Met show overall fading and discoloration as well as local staining. Barro mentioned that there is a slim chance that the prints under study are platinum-toned barytaless silver paper rather than Satista, but this is unlikely, based on historical information about Strand’s papers. She also mentioned that it is unclear whether or not the Satista paper itself is causing this type of deterioration. It might be that just this group of prints that Strand made is deteriorating in this way, due to the processing, storage history, or other variables. It is possible that there are Satista prints in collections in good condition, perhaps presently identified as platinum prints. Further study and more XRF data will help make those determinations.


As part of the research published in Topics in 2003, Barro concluded that the deterioration was related to sulfiding combined with finely divided silver particles and staining possibly related to residual chemistry, but there have been many questions raised by this research. Some of these questions were related to characterization of Satista paper:

  • Does Satista paper have what is called a Japine surface?
  • Was there bromine in Satista paper, because the patent mentioned bromine in addition to chlorine?
  • Some historical literature mentions gelatin, so is it possible that there could be gelatin present as a sizing or binder?


Conservators who heard Barro speak at PMG in 2003 have since asked her practical questions related to preservation:

  • Should we exhibit these prints?
  • How quickly are they changing?
  • How sensitive are these prints?


This talk addressed these questions by sharing new findings from analyzing 15 years of spectrophotometric data collected from Paul Strand’s Satista prints before and after exhibition, as well as performing analysis on an unprocessed Satista paper with a range of techniques: transmission FTIR, ELISA, SEM-EDX, Raman spectroscopy and XRF. (The pack of unprocessed postcard-sized Satista paper was a gift from photographer Alison Rossiter in 2010.)


In general, the analytical results of this study shed some light on the questions above. The study showed no gelatin or bromine in the Satista paper. The question about the Japine surface is as yet unanswered; whether or not Satista has a parchmentized surface is still being investigated. If it does, it is thinner than observed in other prints. Barro also showed SEM images that illustrate where the silver and platinum salts are situated in the unprocessed paper in cross-section (the silver to platinum ratio was 12.5:1), but the implications for processed prints are not yet known. While analyzing the unprocessed Satista paper provided valuable information, it is possible that there were different surfaces made by the Platinotype Company.


To answer the questions related to exhibition and change in the prints over time, they used spectrophotometric data collected over 15 years at the Met. Color monitoring of the photograph collection at the museum began in 1992. Dana Hemmenway conducted a baseline study in 1999, and today the museum continues to collect data before and after exhibition to learn more about change during exhibition and storage periods. Katie Sanderson is the primary collector of this data at the museum. She takes measurements before and after exhibition in Dmin, Dmid and Dmax areas and evaluates the data using the CIE L*a*b* color space. Barro presented the findings that the overall rate of change for Satista prints is higher than for platinum, both in storage and on display. Using data for Strand’s portrait of Harold Greengard as illustration, she also demonstrated that the rate of change is measurably faster under exhibition conditions than during periods in storage. This data is still being interpreted and studied, and some data (such as different directions of change in different areas of the print) is posing new questions.  Research is ongoing, but based on these findings, the study suggests that the approach to exhibition of Satista prints should be conservative. They recommend 40 lux, a sealed package, cool storage, and color monitoring.


PMG Winter Meeting – “Photographic Paper XYZ: de facto standard sizes for silver gelatin prints” by Jennifer McGlinchey Sexton, Feb. 20

Jennifer McGlinchey started her impressive talk with an explanation of the history of lists of photographic paper sizes. She stated that there were no available references that have lists of ‘standard’ sizes. In fact, the lists of sizes they were able to find were very small, and also corresponded to very specific time periods. Further research suggests that these sizes were not considered standard and were certainly not inclusive of all sizes used. Rather than identify ‘standard’ sizes, she identified ‘common’ sizes by the criteria that they appear in five or more of the references. These she concluded were ‘de facto standard sizes.’ For the study, McGlinchey used Paul Messier’s extraordinary paper collection which consists of over 5,000 samples of silver gelatin photographic paper, as well as 9 manufacturer’s sample books and pricelists and 6 encyclopedias:
The use of English-language publications from a few geographic locations (US and Europe) may have been limiting, but in fact, there are very few references from other geographical areas. Concluding that there were common rather than standard sizes is not to say that there were no attempts to standardize paper sizes, but the attempts were never very successful. The result of the study was that she identified over 200 distinct sizes, just over half of which occurred only once. She identified 32 de facto standard sizes. Many of the sizes considered common now in the USA, such as 4×6 and 5×7 inches, are included in that list, but many sizes which are no longer manufactured are also on that list. This includes smaller sizes like 2.5 x 2.5 inch, which were much more common in early days of gelatin silver printing. She mentioned that the measurements for papers grouped together as the same size allowed for a difference of +/1 5 mm along each dimension, to account for natural expansion/contraction, ferrotyping, and so on, which could account for small dimensional changes. As part of the research they also evaluated common thicknesses of silver gelatin paper, and found three de facto standards. The most common was ‘single weight,’ followed by ‘double,’ and finally ‘medium.’ Double weight papers fall above 0.25 mm, medium weight papers under 0.25 and single weight papers under 0.2 mm. The double weight paper started get thicker in the 1930s until the 1950s and then got thinner again, so manufacturers changed the thicknesses over time but not the terminology. It was also found that five common aspect ratios occurred in 88% of the de facto standard sizes. This implies that scaling relationships were a factor for determining silver gelatin DOP paper sizes. Characterization by aspect ratio not only simplifies the dimensional diversity of silver gelatin paper by emphasizing their scaling relationships, but also highlights their relationship with other media. For example, 6:5 is common mainly with plate sizes, 5:4 is the aspect ratio of many large format films. 4:3 is the first motion picture aspect ratio and 8:5 is the golden ratio.
The measurements and other data were recorded in spreadsheets (the full results were published in JAIC, Volume 53, Issue 4 (November, 2014), pp. 219-235). It led to the conclusion that there is no easy answer to these questions. No system of standard paper sizes was successfully put in place for photographic papers. Additionally, available sizes varied widely over time and across geographic boundaries.
This research can be utilized in identification of artist’s methods and paper preferences. One useful application is to study photograms. This technique was used to great effect by Man Ray and Laszlo Maholy-Nagy, contemporaries working in France and Germany respectively. Of course, each print is unique, because it would be difficult to replicate the exact condition since no negative has been used. Of a selection of 163 prints by Man Ray dating from 1920 to 1940, there were 88 photograms and 75 traditional prints from negatives. Compared with the de facto standard sizes identified by this research, the dimensions of 39 Man Ray photograms (roughly 44%) correspond to de facto paper sizes. From 75 prints from negatives, only 25 (33%) correspond to the de facto paper sizes. This survey shows that Man Ray most likely trimmed his photographs from negatives, but didn’t trim his photograms. Averaging about 3.5 mm thickness, the photograms fall into the category of double weight papers.
Man Ray’s process contrasted with the working practices of Laszlo Maholy-Nagy. Print dimensions and estimated thickness for 216 prints by Maholy-Nagy made in Germany between 1922 and 1928 were collected from the catalogue raisonne of his photograms. Of these photograms, 216 or about 89% correspond to the de facto standard sizes identified by this research. The majority of the prints made from negatives were printed on two sizes of paper, 18 x 24 cm and 13 x 18 cm, both de facto standard sizes. This shows that Moholy-Nagy used full sheets of paper for his photograms and didn’t trim them down. The catalogue raisonne describes the thickness measurements of many Moholy-Nagy photograms as single weight or double weight. According to these descriptions Moholy-Nagy used the single weight or double weight papers in equal frequencies and sometimes used both in the same series.
Understanding the de facto standard sizes provides a useful point of comparison of these two artists. Differences in their methods can be due to a variety of factors. Moholy-Nagy was known for his scientific approach to photography, as a record of the interaction between light and physical object composed within the border of the paper. His photograms were complete upon processing. In contrast, Man Ray was more acutely engaged in producing highly refined settings of expression; attention to detail and subtle manipulation apply to all aspects of Man Ray’s photography as evidenced by his skilled practices in retouching and using carefully proportioned mounts.
In summary, there really were a lot photographic paper sizes available, particularly in middle of the 20th century, when these papers were extremely popular. While there are some de facto standard sizes and thicknesses, silver gelatin papers were made in numerous sizes and the majority of paper sizes listed in the references occurred only once.