A note on the early thermographic approaches for the investigation of the Cultural Heritage

In this paper, we present an overview of some of the early applications of Infrared Thermography (IRT) to Cultural Heritage (CH) where Ermanno Grinzato, to whom the present issue is dedicated, was the leading scientist. In such a presentation, the works of arts have been divided into two main categories, namely movable and immovable CH. For each kind of CH, the good quality of the results that have been obtained despite the technical limitations of the adopted experimental equipment is highlighted, having such early results played a crucial role in the subsequent developments, thanks to which IRT has been nowadays established as a valuable technique for the CH surveys.