Abstract
Chromatic variation, colour and luminosity, undergone by the ceramic support protected by the incorporation of a treatment with water repellent products, is analysed. A new methodology is suggested, based on RGB model where quantifiable values from each ceramic sample are obtained through digital measurement of the colour (image histograms), taking as a base the same type of ceramics with no water repellents. Chromatic variation is determined by the type of water repellent and the base material, obtaining the following results: - All the water repellent studied cause variations in the shade and luminosity of the piece. - English red brick (R) is the one presenting less variation of luminosity and shade since it’s been treated with water repellents. - The water repellent of siliconates component is the one which causes less chromatic variation in two of the three bricks studied, the dark brown (T) and the English red (R) one.
Highlights
The research analyses the modifications in the colouring of the ceramic bricks when their surfaces have been treated with water repellent products theoretically colourless, determining which water repellent product causes the lesser change in the surface properties of the ceramic bricks
The minimum number of basic types of ceramics is identified relative to their production process: manual, extruded and pressed
The water repellent product which less alters the chromatic properties of each basic type of ceramics is obtained
Summary
The research analyses the modifications in the colouring of the ceramic bricks when their surfaces have been treated with water repellent products theoretically colourless, determining which water repellent product causes the lesser change in the surface properties (colour and luminosity) of the ceramic bricks. The minimum number of basic types of ceramics is identified relative to their production process: manual, extruded and pressed. Once that selection is established, the chromatic characteristics of each basic type of cerámics are identified. The water repellent product which less alters the chromatic properties of each basic type of ceramics is obtained. Three types of brick have been analysed based on their production process, a manual brick (M), an extruded one (T) and a pressed one (R). The water repellent products for this research are organised in two main groups: organics and organosilicic (Figure 1) (1)
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