ON THE USE OF COLOUR COORDINATES TO EVALUATE FIRING TEMPERATURES OF ANCIENT POTTERY*

Piero Mirti

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Cultural Heritage Materials Analysis Color Science and Applications Building materials and conservation

Abstract

Colour measurement was investigated as a means to evaluate equivalent firing temperatures of ancient pottery. Colour coordinates were determined on samples of six clays previously fired, and then refired, in the temperature range 600–1100°C. Under the adopted conditions, significant variations of colour hue and saturation were normally observed on refired samples only after the original firing temperature had been exceeded; less reliable information was provided by luminosity. Original firing temperatures of clay samples were correctly recognized in most cases by projecting the points representing samples’ colour on to the a*b* plane of the ClEL*a*b* colour space.

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References

1984Archaeological Ceramics 1972Science and Archaeology 1975Examination of ancient pottery using the scanning electron microscope 1969DETERMINATION OF THE FIRING TEMPERATURE OF ANCIENT CERAMICS BY MEASUREMENT OF THERMAL EXPANSION: A REASSESSMENT 1963DETERMINATION OF THE FIRING TEMPERATURE OF ANCIENT CERAMICS BY MEASUREMENT OF THERMAL EXPANSION

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