The colour parameters of CH-Sys were measured during 72 h
after different temperature and luminosity conditions exposition. The time was established at 72 h based on preliminary tests. It was observed that the CH-Sys showed efficient colour change during 72 h of exposition and after this the colour parameters maintained similar. A Chroma Meter CR 400 colourimeter (Konica Minolta, Japan) was used. The calibration uses a white calibration