unnamed cave 60, mortar hole

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unnamed cave_60, _mortar_hole, I_AMC6161
© Copyright Alan Cressler 2011

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We were working in the cave yesterday and found what we think may be a mortar hole. It is possible this was used to produce the pigment. We know from pigment analysis that the images were not produced with straight charcoal but rather a complex of charcoal and other components. This hole does not appear to be entirely of natural origin. It is too smooth and regular. It is full of cane charcoal and other things. Analysis of the contents is pending. Dr. Simek is looking at one of the major art panels. It is possible the pigment was made on site. This image was difficult to take because the hole is located on breakdown with a twelve foot drop-off behind me and a deep crack below me. I used five slave-synced flashes in the upper area and one hand-held Canon flash set at 1/32 full power to trigger them.

title unnamed cave 60, mortar hole
date yyyymmdd hr:mn 2009:02:01 07:33:17
source Flickr
flickr_agent alan_cressler

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