The tested clayey materials were of the type normally used for engobe preparation: white clay, kaolin and bentonite.
Moreno, A., Bou, E., Navarro, María C., García, J. 2000, 'Influencia de los materiales plásticos sobre las características de los engobes. ITipo de material arcilloso', Boletín de la Sociedad Española de Cerámica y Vidriohttp://ceramicayvidrio.revistas.csic.es/index.php/ceramicayvidrio/article/view/778/806. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
It was found that all the studied engobe characteristics varied considerably on modifying the type of clayey material.
Moreno, A., Bou, E., Navarro, María C., García, J. 2000, 'Influencia de los materiales plásticos sobre las características de los engobes. ITipo de material arcilloso', Boletín de la Sociedad Española de Cerámica y Vidriohttp://ceramicayvidrio.revistas.csic.es/index.php/ceramicayvidrio/article/view/778/806. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
The optimal compositions of jade engobe and glossy glaze, the most suitable for this composition, are determined.
Pleshko Marianna Viktorovna, Pleshko Mikhail Stepanovich, Revyakin Aleksey Anatol'evich 2018, 'TECHNOLOGY OF PRODUCTION OF CERAMIC TILES BASED ON DOLERITE AND FUSIBLE CLAY', Vestnik MGSUhttp://vestnikmgsu.ru/index.php/archive/article/download/4164. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
A commercial grade of engobe and green body from one of the national tile companies have been used.
Sousan Rasouli 2017, 'Application of statistical design of experiments for the optimization of floor tileglaze formulation', Journal of Graphic Engineering and Designhttp://www.grid.uns.ac.rs/jged/download/v8n1/jged_v8_n1_p1.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Additionally, the effect of a substrate engobe layer allows some further contribution to the increase of the overall reflectance characteristics.
Lucia Brinchi, Andrea Nicolini, Anna Laura Pisello, Franco Cotana 2013, 'Development of Clay Tile Coatings for Steep-Sloped Cool Roofs', Energieshttp://www.mdpi.com/1996-1073/6/8/3637. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)