Saturday, July 18, 2015
MILK PAINT IN MIDDLE STONE AGE - SOUTH AFRICA:
The
question of tools and materials used to create rock art has received another
fascinating contribution with the discovery of a small piece of flat rock with
a red ocher pigment on it from a rock shelter in northern KwaZuluNatal province
in South Africa that had been occupied by humans during the Middle Stone Age, from roughly 77,000 to 38,000 years ago. An analysis of it found casein, a protein
from milk, mixed with the pigment. Casein has long been used as a binder in
paint, and the milk itself would provide the liquid vehicle to mix the paint
in. Indeed milk paint is a category of do-it-yourself paint that has a long history
and it is still sometimes used to give furnishings an antique look. Casein is
also a popular binder in glues, being an important component in many white
carpenter's glues. A report in the online science journal PLOS/one, and picked
up by Smithsonian.com, reported the discovery and analysis recently.
"The researchers, led by Paolo Villa, a curator at the University of
Colorado Museum of Natural History, first found casein, a protein found in
milk, in a smear of reddish paint on the edge of a stone. The milk would have
helped the powder of ochre bind together into a paste that people may have used
to paint stone, wood or their bodies. The researchers figured that the
mixture was paint, rather than adhesive because milk doesn’t stick that
strongly unless the proteins are mixed with lime and heated." (Fessenden 2015:1)
"Gas
chromatography/mass spectrometry, proteomic and scanning electron microscopy
with energy-dispersive X-ray spectroscopy (SEM/EDS) analyses of residue on a
stone flake from a 49,000 year-old layer of Sibudu (South Africa) indicate a
mixture of ochre and casein from milk, likely obtained by killing a lactating
wild bovid. Ochre powder production and use are documented in Middle Stone Age
South African sites but until now there has been no evidence of the use of milk
as a binder. Our analyses show that this ochre-based mixture was neither a
hafting adhesive nor a residue left after treating animal skins, but a liquid
mixture consisting of a powdered pigment mixed with milk; in other words, a
paint medium that could have been applied to a surface or to human skin. The
significance of our finds also lies in the fact that it establishes the
antiquity of the use of milk as a binder well before the introduction of
domestic cattle in South Africa in the first millennium AD." (Villa
et al 2015:1)
Milk
is seemingly a good choice for mixing paint because it combines the vehicle
with a very effective binder for the resulting paint. It is interesting that
this was so long before the domestication of cattle, and acquisition of the
milk would have depended upon hunting or trapping a lactating bovid. Visit
these sites for the complete story of this fascinating discovery.
REFERENCES:
Fessenden,
Marissa
2015 In South Africa, People Painted with Cow
Milk Long Before They Domesticated Cattle, http://www.smithsonianmag.com/smart-news/south-africa-people-painted-milk-cattle-were-domesticated-180955852/#xBRRpwG4Z2gKsSLx.99, July 9, 2015.
Villa,
Paola, Luca Pollarolo, Elaria Degano, Leila Birolo, Marco Pasero, Cristian
Biagioni, Katerina Douka, Roberto Vinciguerra, Jeannette J. Lucejko, and Lyn
Wadley,
2015 A Milk and Ochre Paint Mixture Used 49,000 Years Ago
at Sibudu, South Africa, PLOS One (online
journal), June 30, 2015.
Labels:
binder,
Middle Stone Age,
paint,
pictograph,
rock art,
South Africa,
vehicle
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