Carbon dating oil paintings
When pressed, the expedition's Aboriginal guide explained their creation: Long ago Kujon a black bird, painted on the rocks.
He struck his bill against the stones so that it Bleed, and with the blood he painted.
In a detailed study of 66 Bradshaw panels, approximately 9% of the Bradshaw images have clearly been vandalized.
Some were scratched with stones, some damaged by thrown stones, and some have been broken by hammering with large rocks.
The most notable has been the work undertaken by amateur archaeologist Grahame Walsh, who began work there in 1977 and returned to record and locate new sites up until his death in 2007.
The results of this work produced a database of 1.5 million rock art images and recordings of 1,500 new rock art sites.
American archaeologist Daniel Sutherland Davidson briefly commented on Bradshaw's figures while undertaking a survey of Australian rock art that he would publish in 1936.
Davidson noted that Bradshaw's encounter with this art was brief and lacked any Aboriginal interpretations; furthermore, as Bradshaw's sketches of the art were at this time the only visual evidence, Davidson argued that they could be inaccurate and possibly drawn from a Eurocentric bias.
In a subsequent address to the Victorian branch of the Royal Geographical Society, he commented on the fine detail, the colours, such as brown, yellow and pale blue, and he compared it aesthetically to that of Ancient Egypt.Furthermore, the figures are ornamented with a diversity of objects such as belts, headdresses, bags and tassels, while other material culture is sometimes depicted, such as boomerangs and wands.While Bradshaw initially described the colour of the art as having shades of pale blue and yellow, most figures have a deep purple-red hue, mulberry colour or a red to yellow-brown colour.Many of the ancient rock paintings maintain vivid colours because they have been colonised by bacteria and fungi, such as the black fungus, Chaetothyriales.The pigments originally applied may have initiated an ongoing, symbiotic relationship between black fungi and red bacteria.