Three archaeological reviews on prehistoric (Domingo Sanz and Chieli 2021), Roman (Salvadori and Sbrolli 2021) and Medieval (Murat 2021) wall paintings clarify the archaeological and historical/cultural framework.
The second group of contributions is focused on pigments, starting from a philological essay on terminology (Becker 2021). Furthermore, several issues concerning the degradation and conservation of mortars and plasters are addressed from practical and technical standpoints (La Russa and Ruffolo 2021, Caroselli et al. An insight into their production, transport and on-site organisation is further provided by DeLaine ( 2021). The first group of contributions explains how mortars have been made and used through the ages (Arizzi and Cultrone 2021, Ergenç et al. The chosen perspective is that of a multidisciplinary scenario, capable of combining, integrating and solving the research issues raised by the study of mortars, plasters and pigments (Gliozzo et al. This Topical Collection (TC) covers several topics in the field of study, in which ancient architecture, art history, archaeology and material analyses intersect.
Drawbacks and issues are discussed with concern to the identification techniques. Sources, alteration phenomena, identification methods and analytical evidence is given for the main organic colourants with concern to red, yellow, green, purple and blue hues. Recent diagnostic studies, however, brought evidence that their use was not fragmentary on the contrary, there seems to be continuity in the centuries, at least with regard to the most widely used such as madder, Tyrian purple and indigo. The use of organic colourants in wall paintings has been given little attention in the past, perhaps on the assumption that they were rarely used by ancient artists. The term organic colourants is referred to the chemical nature of these compounds but not to the way of application therefore, organic colourants can be dyes, lakes or pigments.
The present contribution deals with the use of organic colourants in wall paintings, polychrome pottery and painted stone artworks, i.e.
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