Egyptian blue, also known as cuprorivaite, is a synthetic compound: a calcium-copper tetrasilicate, obtained by heating a mixture composed of calcite, siliceous sand, copper compounds, and natron or plant ash, to a temperature ranging between 850 and 950°C1,56. Egyptian blue was detected by...
This is the colour element in paint. Pigments can consist of a wide variety of ingredients, including minerals, natural/artificial dyestuffs, and other synthetic compounds. In addition to colour, pigments may provide paints with other properties including opacity, hardness, and durability. ...
presence or absence of aluminium. Detection of alum, being historically the most important mordant, is of special interest. The benchtop micro-XRF instrument used for mapping khipu samples has the advantage that measurements can be carried out in a vacuum, thereby enabling detection of lighter ...