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Pigments and palettes from the past – science of Indigenous art
Some Indigenous paintings have lasted thousands of years … so what is it about the pigments that make them so long-lasting? Carolien Coenen/Flickr, CC BY-NC-ND
Andrew Thorn, International Centre for the Study of the Preservation and Restoration of Cultural PropertyIndigenous Australian practices, honed over thousands of years, weave science with storytelling. In this Indigenous science series, we look at different aspects of First Australians’ traditional life and uncover the knowledge behind them. Here we examine the chemistry and techniques behind perhaps the most iconic element of Indigenous life: rock art.
Visitors to Uluru might also find themselves at Mutitjulu Waterhole in the company of a travel guide filled with wisdom about the meaning of the paintings. Uluru has almost 100 painted sites, of which I have studied most, and tourists will encounter a dozen or less.
Anangu people will explain that the paintings have many meanings depending on the audience. An undulose band may be a snake in one story, a creek in another. A tourist may or may not be told that the paintings at Uluru are in themselves not necessarily highly charged with spiritual values but rather an auxiliary expression in response to the power of the rock itself. The main stories, the big stories, are told in the rock.
So why did people paint? What did it mean? How was it done? Why did they use certain pigments? Why has it lasted so long? The answers inevitably vary depending on where you are standing and with whom.
Painting techniques
Paint has been applied to rocks, almost all types, by a variety of application techniques. Marks were made using what appears to be a dry crayon or pastel application, where a piece of pigment-rich soft rock has been drawn across the surface.
A wide variety of implements were used as brushes to apply water-dispersed pigment, and there is ethnographic evidence of chewed bark and other suitable implements being used – as they still are today for bark paintings.
Fingers may have been used and in one rare and precious place across the flood plain from Ubirr in Kakadu, senior elder of Kakadu, Bill Neidjie, once pointed to a place in the ceiling where his footprints still remained from his youth where he was dipped in paint and pressed against the ceiling.
Stencil techniques have been used to portray everything from full bodies (the finest examples in Carnarvon Gorge in Queensland), to hands, weapons, and introduced objects of fascination such as clay pipes and wool shears. There are some very fine and complex hand prints east of King’s Canyon in the Northern Territory, pressing three coaxial U shapes to the rock by painting the two inner, the two outer fingers, and the palm.
Paintings can be highly detailed within an individual figure but rarely narrative panels extend across a whole site or rock panel. More typically pre-existing paintings are painted over with no regard for their meaning or author.
There are examples of important images that have been faithfully reproduced because of their fundamental meaning for a given site. It is important to underline this fact, that repainting, when considered over several hundred years is not commonly faithful reproduction but an accumulation of new expression.
Photographs of Mutitjulu waterhole at Uluru, taken by Australian anthropologist Charles Mountford in the late 1930s, are almost unrecognisable due to the accumulated new painting since that time.
Regular painting at Uluru ceased in the 1960s with only a few isolated cases of painting through to the 1980s.
Pigments
In Australia, pigments were chosen from naturally occurring minerals with little evidence of manufacture. Charcoal is one exception to this, but it could be argued that it was a routine by-product rather than a deliberately manufactured pigment.
There is some unsubstantiated speculation that yellow ochre was heated to turn it red and cases where European pigments were adopted. This availability of new colours did not result in the adoption of more colourful paintings, with the exception of some use of washing blue (a coarse synthetic ultramarine) in parts of Arnhem Land.
The traditional palette, that is to say the most commonly encountered colours, are red, white, yellow and black, with variations on the composition of these but with little evidence of mixing to create intermediate tones.
By studying the trace elemental composition of pigments it is possible to connect them to geological events, and hence their source. Such studies proves that pigments were traded, in some cases over long distances. It is difficult to postulate however that distance of manuportation equals significance or spiritual value, but further research may enlighten this fact.
Kaolin – a soft white clay – is abundant in most parts of Australia but where calcite is found, as it is in the river beds of Arnhem Land, it becomes the more common white pigment. The Kimberly is more abundant in the carbonate mineral huntite and yet it is rare to find huntite used outside this region, despite it being a brighter white than kaolin.
Examples of trade exist and some of these provide interesting insights into the selection of paints.
Just south of Uluru, near the South Australian border, lie a group of sites containing a metallic red pigment characteristic of the Walgi Mia quarry 1,000km to the west. It is said these caves and their paintings were created by the emu creation beings who had a dreaming path extending out to the western coastline and which would have passed very nearby the pigment source. It is not surprising therefore to find a pigment that has come from such a distance.
What is fascinating is that near to Walgi Mia is a very large painting site, Walghanna, that features a very large emu footprint. Emus are not known to have existed in the vicinity of Walghanna, according to the archaeological record and oral history. There appears to have been a two-way trade in materials and stories.
Durability and age
The 1930s photograph by Mountford, showing paintings that no longer exist due to subsequent overpainting indicates, among other things, that all of what one sees at Mutitjulu today is “modern art” painted in the period 1936-1962.
I had great fun at a conference using Powerpoint to fade between an image of the Mutitjulu panel and Convergence, a Jackson Pollock painting with an almost identical scramble of lines, shapes and colours, aimed to make the point that not all rock art is ancient. Some other more significant statements can be added. Most very old paintings survive as very thin remnants.
There are cases in Kakadu of whole colours falling off an image, resulting in, for example, birds without legs. Some very old paintings have survived for thousands of years with every detail seemingly intact, such as those of the dynamic style and others of that period.
These paintings tend to be monochromatic red, applied with haematite that is both very fine and non-responsive to humidity or chemical alteration.
Studies have shown degradation pathways for rock art pigments and it is no surprise that charcoal will jump off the rock very quickly, followed by kaolinite, huntite, then yellow and red ochres.
Dark red haematite is usually the last surviving pigment, unless a painting is subject to floodwaters or other physical agents. There are examples of red paintings surviving under water at Jowalbinna near Laura and east of Mt Isa, both in northern Queensland.
Pigments survive depending on their stability to climatic variations and then ultimately due to their ability to intimately bond with the rock.
It has to be stated that the greatest threat to indigenous rock paintings is the tourist, who out of curiosity rather than malice, desires a sensory connection to inanimate culture.
Having on many occasions adopted the disguise of the tourist I have observed a bus load of fascinated fellow travellers comparing their own hand with that sprayed on the ceiling of Mulga’s Cave just north of Wave Rock.
This is an act of connection with someone from the past but its very execution ensures that connection will soon be lost.
See also:
Stories from the sky: astronomy in Indigenous knowledge
Indigenous medicine – a fusion of ritual and remedy![]()
Andrew Thorn, Heritage Consultant and Materials Conservator; Sessional Lecturer in Stone Conservation, International Centre for the Study of the Preservation and Restoration of Cultural Property
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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World's Most 15 Greatest Living Rocks

1. Great Sphinx of Giza (Egypt): A reclining lion with a human head that stands on the Giza Plateau on the west bank of the Nile, near modern-day Cairo, is the largest monolith statue in the world. Standing 73.5 m (241 ft) long, 6 m (20 ft) wide, and 20 m (65 ft) high, the Great Sphinx of Giza is also the oldest known monumental sculpture, and is commonly believed to have been built by ancient Egyptians in the third millennium BCE. The Great Sphinx faces due east and houses a small temple between its paws.


3. Mount Rushmore (USA): A famous monumental granite sculpture created by Gutzon Borglum, Mount Rushmore is located within the United States Presidential Memorial that represents the first 150 years of the history of the United States of America with 60-foot (18 m) sculptures of the heads of former United States presidents (left to right): George Washington, Thomas Jefferson, Theodore Roosevelt, and Abraham Lincoln. The entire memorial covers 1,278.45 acres (5.17 km2) and is 5,725 feet (1,745 m) above sea level. The memorial attracts approximately two million people annually.

4. Leshan Giant Buddha (China): Built during the Tang Dynasty, the Leshan Giant Buddha is carved out of a cliff face that lies at the confluence of the Minjiang, Dadu and Qingyi rivers in the southern part of Sichuan province in China, near the city of Leshan. The sculpture, which is seventy one meters (about 230 hundred feet) tall dwarfs the tourists that flock to see it. It is positioned so that it faces Mount Emei and stands at the meeting place of three rivers. Although the Government of China has promised a restoration program, the statue has suffered from the effects of pollution, particularly over the last twenty years. Fortunately, the statue was not damaged in the Sichuan earthquake of 2008. 5. Mahabalipuram Shore Temple (India): Built on the shores of the Bay of Bengal in Mahabalipuram (India) in the early 8th century by the Pallava King Rajasimha. The shore temple


6. Abu Simbel (Egypt): A set of two temples near the border of Egypt with Sudan, Abu Simbel was constructed for the pharaoh Ramesses II who reigned for 67 years during the 13th century BC (19th Dynasty). The temples were cut from the rock and shifted to higher ground in the 1960s as the waters of Lake Nasser began to rise following completion of the Aswan High Dam.The Great Temple is dedicated to Ramesses II and a statue of him is seated with three other gods within the innermost part of the rock-cut temple (the sanctuary). The temple's facade is dominated by four enormous seated statues of the Pharaoh (each over 20 metres or 67 feet high), although one has been damaged since ancient times. The Small Temple was probably completed ahead of the Great Temple and is dedicated to Ramesses' favorite wife, Nefertari. At the entrance stand six 10-metre-high (33 feet) rock-cut statues - two of Ramesses and one of Nefertari on either side of the doorway.

7. Dazu Rock Carvings (China): The Dazu rock carvings in Chongqing, China are hewn from the cliffside, featuring more than 5,000 statues and over 100,000 Chinese characters of inscriptions or epigraphs. It is reputed as 'the county of rock carving' and it’s located at the southeast of Sichuan province. The Dazu Rock Carvings was built from 650 in the Tang Dynasty and continued to the Ming Dynasty (1368-1644) and the Qing Dynasty (1616-1911). Among the rock carvings, there are more than 5,000 statues and over 100,000 Chinese characters of inscriptions and epigraphs. 8. Church of St. George (Ethiopia): The Church of St. George is a monolithic church in Lalibela, Amhara Region, Ethiopia. It is the most well known and last built (early thirteenth century) of the eleven churches in the Lalibela area, and has been referred to as the "Eighth

Wonder of the World". The dimensions of the complex are 25 meters by 25 meters by 30 meters, and there is a small baptismal pool outside the church, which stands in an artificial trench. According to Ethiopian cultural history, Bete Giyorgis was built after King Gebre Mesqel Lalibela of the Zagwe dynasty had a vision in which he was instructed to construct the church; Saint George and God have both been referred to as the one who gave him the instructions.As of 2006, Lalibela is still a pilgrimage site for members of the Ethiopian Orthodox Tewahedo Church; the church itself is part of the UNESCO World Heritage Site "Rock-Hewn Churches, Lalibela".

9. Borobudor (Indonesia): Officially, Borobudur is a ninth-century Mahayana Buddhist monument in Magelang, Central Java, Indonesia. Actually, it is much older than that. The monument complex comprises six square platforms topped by three circular platforms, and is decorated with 2,672 relief panels and 504 statues of Rama citizens. Each wall has a story that relates to the stories of the birth of Buddha and other Buddha figures. A main dome, located at the center of the top platform, is surrounded by 72 Rama citizens seated inside perforated stupa.





14. Mada'in Saleh (Saudi Arabia): Located in northern Hejaz (modern day Saudi Arabia), Mada'in Saleh --also called Al-Hijr ("rocky place")-- is an ancient city that was inhabited by Thamudis and Nabateans and was then known as Hegra. Some of the inscriptions found in the area date back to the 2nd millennium BC. However, all the remaining architectural elements are dated to the period of the Thamudi, Lihyan and Nabatean civilizations, between the 1st millennium BC and the second century AD. Mada'in Saleh is not only Saudi Arabia's most spectacular touristic site; it is also one of the greatest historic sites in the world. The rock tombs in this early morning light are of such an extraordinary beauty, consisting of different shapes and sizes, that gives Mada'in Salih a truly charming feeling. This historic sister city, Petra the former capital of Nabataean Kingdom, is located only 150 miles away to the north across the border with Jordan.

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