“…Colour is a complex property of materials that can in some cases be considered as a marker of another property more difficult to measure: examples can be found in the textile industry [1,2] or food industry [3,4]. In this study, presented in two parts (part I and part II, here), the aim is to show how optical measurements can help to estimate the moisture B Helene Garay helene.garay@mines-ales.fr 1 C2MA -Ecole des mines d'Alès, 6 avenue de Clavières, 30319 Ales Cedex, France content of granular materials.…”