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  2. -- Ochre Stone Processing Plant In Iran

ochre stone processing plant in iran

Jun 16 2009 Compound adhesives made from red ochre mixed with plant gum were used in the Middle Stone Age MSA South Africa Replications reported here suggest that early artisans did not merely color their glues red they deliberately effected physical transformations involving chemical changes from acidic to less acidic pH dehydration of the adhesive near wood fires and changes to

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