Chromatic Parameters as Performance Indicators for Stone Cleaning Techniques

摘要

To determine the degree of soiling of urban build- ings subject to environmental pollution and later stage, to asses the effectiveness of cleaning techniques on the types of stone used in the construction of these buildings, it is very useful to define the chromatic parameters(L*, a*, b*, C*, WI, and YI)before and after treatment. A compar- ative study of these parameters and the original color of the stone is carried out. The best cleaning performance is achieved using a hot water jet at a temperature of 90 deg. C and a pressure of 120 bars.