Colouring metals in the Far East

By Agnese Benzonelli

How far can someone go in the name of research? In my case quite a long way. For a month, I loosely taped tiny plates of metal to my hands and woke up every morning with green stains on them. I was investigating craft recipes employed in the far East since the fourteenth Century to create coloured metal and alloys used for beautiful small artefacts. Whereas Western taste preferred the natural colour and the polished lustre of metals, the Eastern preference was to use the process of chemical patination, where different chemicals react with the surface of copper and copper alloys to form new coloured compounds.

Fig.1: Left: a tsuba (handguard of Japanese sword) made of shakudo and gold; BM-TS244. Right: a Chinese gu-tong box; BM-1992,1109.2. Photos made by A. Benzonelli.

The Japanese created a whole class of coloured alloys, called irogane. They added small amounts of different elements to the copper and simmered it in a solution containing copper salts, alum, vinegar and other ingredients, to form coloured patinas on the surface. The most beautiful patina, shakudo, was made with copper and gold and achieved a deep blue-black colour. Combining a variety of alloy compositions and solution ingredients, they were able to create hues ranging from pale brown to black. Inlaying different irogane, gold, silver, and lacquers, they were able to create small artefacts and swords fittings with complex and visually impressive designs and patterns.

Fig.2: Picture of the 13 Japanese solutions created and tested taken from Japanese recipes reported in Eastern books.

Later on, Chinese craftspeople imported the technique from Japan, possibly through travellers or trying to copy the Japanese artefacts, and, from the Ming period (1368-1644), they used it to colour ink or tobacco boxes. In contrast to the Japanese irogane, the Chinese would patinate a gold-silver alloy only, which resulted in a dark colour similar to that of shakudo, which they called gu-tong. In both cases, the precious metal content was 1-3%, a larger amount would not affect the final patina colour.

There’s not a lot known about the two different recipes the Chinese craftsmen employed to produce their patinas. However, we do know that one process they utilised was similar to that used by the Japanese to produce the irogane,butwe have no precise recipes for the solutions. Another involved handling the metal until the perspiration from their hands corroded the surface.

Creating and play with metal colours has always fascinated me. Why using gold and silver to achieve that dark colour, instead of cheaper alternatives? What was the role of the different ingredients used in the recipes? Could sweat really be used as a patinating solution? Why did Japanese recipes tell not add precious metals to bronze (copper alloyed with tin) but only to pure copper? Could it be confirmed through scientific analysis that the technology was really transmitted from the Japanese to the Chinese culture? To find answers, I needed to conduct a systematic experimental research which could explain the reasons behind the technological choices of Japanese and Chinese craftsmen.

 I reproduced a series of alloys with tin, gold and silver, which I then patinated, following the recipes for shakudo and gu-tong from available texts. These are not numerous, as the recipes were mainly kept as secret and passed from father to son. We have city records, information sheets given by dealers and, in Japan, technical texts on metal working. I analysed the resulting patinas with techniques borrowed from modern material science, and used the experimental data as reference for the interpretation of historical patinated artefacts in museum collections.

I found that, for both the Japanese and Chinese recipes, the presence of gold in the alloy did, in fact, change the colour of the final patinas, which resulted in a better, more uniform and darker hue. I also noted how parameters such as the fine grade of surface polishing prior to the patination, the use of tin-free alloys, the selection of copper acetate as a main ingredient and the addition of vinegar are all processes and actions that led to a reduced patina growth. And as it turned out, sweat was indeed an effective patinating solution in the Chinese patination (as it can be noticed by the green corrosion products left on the hands), but the presence of gold in the alloy composition is nonetheless essential to obtain a dark hue, not achieved in gold-free alloys. Sweat is a slightly acidic solution, similar to that of used by Japanese craftsmen, essential to create a coloured copper oxide on the surface in just 48 hours of handling. Similarly, in both technologies cleaning of the alloy before or after the procedure suggested in Japanese texts and the abrasive action of the hands in the Chinese method are both similar and crucial steps in the patination process. I concluded from these findings that a dark patina was not the only feature that the craftsmen of both cultures had been striving for. They also seemed to be after a shiny appearance, given by the metallic lustre coming from the alloy.

Fig. 3: Alloys of different compositions patinated with Chinese patination.

In combining experimental and historical observations I gained an understanding of the intentions behind the technological choices made by the Japanese and Chinese artisans. My analysis confirmed the deliberate nature of these choices made to achieve dark and shiny blue-black colours otherwise impossible. This confirmed the importance of colour as a driver of these artisanal processes, and supports the idea that the knowledge was transmitted between the two cultures.

Was it worth in the end – the green hands and other discomforts suffered in the name of research? It was the first study to provide a scientific basis to our knowledge of the methods and choices made by those people, the ingredients they employed in making dark patinated artefacts, and contributed to our pool of knowledge of the artisanal methods and practices described in historical sources. So yes, it definitely was, and I would definitively do it again.

Announcing… a new journal!!!

By Dorothy Cashman

The European Journal of Food, Drink and Society is now live! It is hosted at the Arrow website, which has some other great journals. But please come check out the page for the journal for details on our aims and submission process.

We see this journal as an exciting new critical and interdisciplinary space where scholars can debate and progress research on the study of food and drink, whether from global or local levels. As editors, we each approach the subject area from our own academic perspectives. We strongly believe that our ability to appreciate the reach of research related to food, drink and society across disciplines is intrinsic to (and reflected in) the stimulating publications that we have been witness to over the last several decades.

We believe that this journal will add to that conversation, and want you to come be a part of it. 

From the outset, we have been encouraged by people’s interest in our project; this is manifest in the wonderful editorial board supporting us in this venture.

Dear academic and independent researchers… for that paper that you are working on right now, we are here and welcome your submissions.    


Editorial note: The Recipes Project is excited to welcome EJFDS to the wider community of food scholarship. Congratulations!

Image Credit: The Newberry Library Postcard Sender.

Recipes for Mud Pies

By Lisa Smith

Beginning a mud pie.

By the end of February, I had set up nearly all of this month’s posts to publish. But not this one. It’s been less than a month, but it feels like a lifetime ago. Back then, I was preoccupied with the community that came from the UK strike. Since then, though, a pandemic has been declared — and it’s increasingly clear that virtual community is  more important than ever.

Today’s post had not yet been set, as I was planning to cross-publish something.  But things had gotten on top of me before I could do it… like (virtually) coming back from strike to move all of my teaching for the last week online because our university had more-or-less closed.  

I’ve been working from home all week, with a tiny co-worker keeping me company. Being at home with her has meant enforced time out in my day to play and to breathe fresh air. On today’s menu: making mud pies.

My mud pie.

Throughout our playtime, the child narrated how to make a mud pie.

Take some dirt from this pile, then add leaves, twigs, and plant scraps. Tap it into your pail. Turn it upside down for serving.

Another variation included the fancy pies (see below) that could be served in their dishes.

What the child didn’t say, though, is that making mud pies is a fundamentally sociable activity. What is the point of making them if you don’t have someone to share them with?

The Recipes Project  had already been taking stock of our future direction by looking at our blog stats and audience. We had been wondering what they could tell us about our wider community and what you might like to see from us. Over the past week, we’ve also been thinking a lot about the sudden changes in our (and our contributors’) work and personal lives. And virtual communities have become even more important than ever! 

As ever, we’re delighted to hear from you and would love it if you let us know in the comments what you would like to see from us in the future, whether content, community building, or events…  Please join us in making mud pies — or, thinking about what we want to see from our wonderful community of readers and contributors.

A fancy mud pie offering.

Recipes for the Inner Chamber: Vernacular Manufacturing in Early 20th Century China

By Eugenia Lean

In the 1910s, a curious print culture phenomenon appeared in China’s urban areas.  Journals such as the Ladies’ Journal (Funü zazhi) and Women’s World (Nüzi shijie) began to run columns and articles that provided recipes for manufacturing soap, hair tonic, perfume, and rouge at home.[i] They often explained the chemistry behind the manufacturing process and promoted the use of modern lab equipment and glassware to produce the desired items. The pieces deemed their detailed technical manufacturing information as highly appropriate for genteel women to apply in their inner chambers.

The cover of the January 1915 issue of Women’s World features a respectable woman who was the ideal reader of recipes for manufacturing cosmetics at home. Source: Chinese Collection of the Harvard-Yenching Library, Cambridge, Mass.

A typical example of the gendered portrayal of domestic manufacturing in these publications can be found in the piece titled, “An Exquisite Method for Manufacturing Hair Oil,” that appeared in first run of the Women’s World (1914–1915) column, “The Warehouse for Cosmetic Production” (hereafter, “The Warehouse”), and its companion piece that appeared in the February issue. As the editor noted in the February entry, the first article had elicited much interest and a woman reader by the name of Mme. Xi Meng had already sent in a request for more tips (Tianxuwosheng 1915, 3). The February issue included a recipe for hair tonic, which listed its ingredients in both Chinese and Latin:[ii]

  • 純粹硫酸                                                      Acidum Sulphruicum [sic]
  • 檸檬油                                                          Oleum Limonis
  • 精製植物油即前節製原料法中自製之油
  • 玫瑰精                                                          Spiritus Rosae
  • 硼砂                                                              Borax
  • 橙花水                                                          Aqua Aurantii Florum
  • 酒精                                                              Spiritus
  • 洋紅細粉亦須自製
  • 丁香油                                                          Nelkeuöl [sic]
  • 肉桂油                                                          Oleum Cinnamomi
  • 橙皮油                                                          Oleum Aurantii Corticis
  • 屈里設林                                                      Glycerin
  • 白米澱粉即本節製法中自製之水磨粉
  • 白檀油                                                          Oleum Santali

(Chen Diexian 1915, vol. 2 [February], 4)

Many of the items could be purchased in Shanghai’s pharmacies, but since spiritus rosae was particularly expensive, the editor wanted to make its recipe readily available. The recipe instructed:

Extract the fragrance of fresh flowers, and attach it onto something solid, so that it lasts and does not disappear. There are many ways of doing this. One can use a method for suction; the method for squeezing, the method for steaming, the method for soaking. None of these are as ideal as the method for absorption. To make spiritus rosae, use the method for absorption (Tianxuwosheng 1915, 6).

What followed was a highly detailed and technical description of how to achieve this method at home. The tools, instruments, and materials needed include bottles, tubes, alcohol burners, hydraulic acid [sic], and no less than five pounds of marble.

China had a long history of manufacturing cosmetics at home. The knowledge behind this domestic production tended not to be written in recipes, but was embodied and passed down from generation to generation. Domestic producers would thus not have been likely consumers of these printed recipes.

As urban consumption of makeup and toiletry items grew in the 1910s, manufacturing such items at home would also seem less pressing. To understand why these pieces appeared when they did — and who was consuming them and why, it is worthwhile to consider what was unprecedented about them.

Appearing in China’s burgeoning mass media, new-style columns like “The Warehouse” made certain skills public, presented them in new terms for new purposes, and made them readily available for a far greater reading and practicing audience than ever before. The new epistemological frame within which the knowledge was presented (chemistry and physics) and the material accoutrement (lab equipment and modern glassware) stipulated as necessary also attracted readers.

The application of these recipes would have required considerable investment in resources and time. Chemistry knowledge was necessary and some called for considerable lab equipment. The instructions to manufacture the spiritus rosae ingredient for hair oil, for example, listed the following items as necessary:

Alcohol Burner—1; Alcohol—2 lbs; Glass tube of 2 centimeter diameter—½ stem; Long-necked glass funnel—1; Double-opening bottle—1; Washing ‘gas’ bottle—1; Wide-mouth bottle that holds 1 lb—1; Wide-mouth bottle that holds 5 lbs—1; Marble—5 lbs; Hydrochloric acid—1 lb (Tianxuwosheng 1915, 4).

Given the nascent state of China’s glassware industry, chemical apparatuses were often imports and available for purchase at a cost at exclusive scientific-appliance stores such as Shanghai’s China Educational Supply Association. Once producers procured the ingredients and equipment, they then had to follow detailed instructions.

To achieve the method of absorption, practitioners were instructed to drill holes into stoppers that were to plug the glass bottles; the holes had to be large enough for a glass tube and funnel to be inserted; the glass tube then had to be bent. Instructions on how exactly to use an alcohol burner to heat the glass and mold it to the appropriate shape were provided.

Visual of lab equipment needed for a recipe on how to manufacture spiritus rosae, an ingredient for hair oil, in “The Warehouse” column in the Women’s World. Source: Tianxuwosheng 1915, 5.

While genteel women were the supposed readers of these recipes (and those with the curiosity, means and knowledge to apply these recipes could have done so), participants in the reading community of these recipes included men. Male consumers of these pieces included connoisseurs of technology, dabblers in chemistry, young students and budding industrialists.

It was far from automatic for the well-educated, male or female, to turn toward production and manufacturing as the literati had long felt a severe distaste for hands-on engagement with things for subsistence or commercial purposes. Yet, by 1915, there was a growing sense that this was necessary. The persistence of internecine warfare and imperialist aggression dashed the initial hopes of the 1911 republican revolution. With the chaos of republican politics threatening national strength many of China’s lettered men and women started to explore new regimes of knowledge and experiment with new social and occupational roles, including those of the once taboo realms of industry, manufacturing and commerce.

It was in this context that these recipes helped cleanse the hands-on work in industry and manufacturing of its negative connotations. These “how-to” pieces became sites where experiential engagement with chemistry and manufacturing was promoted as crucial in strengthening China, as well as a sign of good taste and bearing. They became part of the arsenal of strategies available for readers navigating their new cosmopolitan identities in a post-civil-service-examination arena of urban playgrounds and industrial centres. By appreciating these pieces with a sense of refined curiosity or in a posture of playful leisure, readers could define their sense of exclusivity based on notions of production that were tasteful and authentic in terms of their scientific, domestic, and noncommercial nature.

The domestic realm as a site of production also served as a metaphor for the larger marketplace in treaty ports that existed beyond the reach of the state. There, scientific, commercial, and manufacturing knowledge increasingly displaced moral knowledge and statecraft as the preferred epistemological foundations for a competitive nation.

Just a few years later, a strong reaction rose against presenting chemical experimentation and manufacturing as a dilettantish endeavor appropriate for genteel women. With the May Fourth Movement in 1919, Sai Xiansheng, or “Mr. Science,” would emerge as part of the slogan “Mr. Science and Mr. Democracy,” and science was, along with democracy, promoted as the foundation of a powerful nation. The portrait of the genteel woman engaging in leisurely production of cosmetics at home became emblematic of a “traditional” culture that had long fettered China’s modernization.

These recipes have been long overlooked by historians as insignificant as a result. Yet, they deserve to be reconsidered. Though they vanished quickly from the pages of China’s urban periodicals, they were historically significant. They were indicative of a period before science and manufacturing had been formalized in China and when efforts to learn and do industrial production was “vernacular,” occurring in ad hoc, informal and curious places (Lean 2020).


 

[i] Articles in the Ladies’ Journal include Ling Ruizhu, “A brief explanation of the methods to make cosmetics,” Funü zazhi 1.1 (Jan 1915): 15-18; Hui Xia, “Method for Making Rouge,” Funü zazhi 1.3 (March 1915): 15-16; Shen Ruiqing, “Method for Manufacturing Cosmetics,” Funü zazhi 1.5 (May 1915): 18-25. In 1915, Women’s World featured a new column from January to May, “The Warehouse for Cosmetic Production” that ran recipes and instruction on manufacturing cosmetics every month.

[ii] These ingredients are better known as sulfuric acid, oil of lemon, the essence of roses (i.e., the scent of roses), borax or hydrated sodium borate, orange flower water, alcohol, oil of cloves, oil of cinnamon, oil of orange peel, and sugar alcohol, rice starch and oil of sandal wood. A couple of ingredients are not listed in Latin. Glycerin is English and Nelkeuöl, which is misspelled in the article, and should be spelled Nelkenöl, is the German word for oil of cloves. The first ingredient, sulfuric acid, is also glossed and spelled incorrectly as “Acidum Sulphruicum.” The foreign-language rendering of several of the ingredients helped establish that sense of cosmopolitanism. Yet, mistakes were present and speak to the complex nature of the translation process and the diverse linguistic circuits these recipes traversed.

References

Lean, Eugenia. Vernacular Industrialism in China: Local Innovation and Translated Technologies in the Making of a Cosmetics Empire, 1900-1940. New York: Columbia University Press, 2020.

Tianxuwosheng. “Huazhuangpin zhizao ku.” Nüzi shijie 2 (February 1915): 3.