Original articleCyclododecane as opacifier for digitalization of archaeological glass
Section snippets
Research aims
This paper proposes the use of cyclododecane, a very common conservation material, for 3D acquisition of reflective/refractive archaeological artifacts. Thanks to the fact that it sublimes at room temperature leaving no residuals and its good film-forming capabilities, its use as an opacifier allows using general-purpose triangulation based 3D laser scanners without damaging original objects. A set of evaluation experiments is introduced in order to demonstrate that quality of achieved results
Experimental
In order to evaluate how CCD performs as a whitening spray, to measure the error introduced in the acquisition process and to compare it with other general-purpose industrial whitening sprays, a set of evaluation experiments have been developed.
First experiment deals with the sublimation speed of CCD in accelerated conditions (by directing a hairdryer to an over-sprayed object) and shows the most interesting characteristic of this material. Second and third experiments deal with the measurement
Results
According to all previous experiments, the advantages arising from cyclododecane's chemical stability and the fact that it sublimes at ambient temperature make it a perfect candidate for the acquisition of reflective/refractive archaeological artifacts, even taking into account that its particle size is bigger.
Fig. 7 shows the results achieved when scanning a set of glass artifacts using and not using CCD as a whitening spray, whilst Fig. 8 shows one of the artifacts sprayed with cyclododecane
Conclusions
This paper has presented an alternative application for a widely used material in heritage conservation and restoration: cyclododecane. Applied as a spray, CCD creates a thin, white opaque film on the surface of artifacts that allows acquiring them using triangulation based 3D laser scanners.
Thanks to its chemical stability and to the fact that it sublimes at room temperature leaving no residuals, CCD is a perfect candidate to solve reflection/refraction issues during the scanning process.
A set
Acknowledgements
This work is supported by the “Programa de Ayudas de Investigación y Desarrollo (PAID)” of the Universitat Politècnica de València and the “Plan Nacional de I+D+i 2008–2011” from the Ministerio de Economía y Competitividad of Spain, Projects ID: HAR2012-38391-C02-01 and HAR2012-38391-C02-02.
Authors would also like to acknowledge the collaboration to the “Museo de Cerámica de Manises” and especially to its director Mrs. Sara Blanes Ibáñez.
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