Opus signinum is a lime mortar mix that includes crushed pottery as an aggregate. Because it is water-resistant, it was used to line hydraulic structures like pools and aqueducts. While there have been numerous recreations of Roman ‘concretes’ in the past, hydrophobic linings have received little attention, and all preliminary studies in these recreations have paid more attention to the dry components and the lime than to the hydric needs of the mortar. The experiment presented here was to gain a better understanding, with the help of traditional builders, of the process of mixing and applying hydrophobic linings and calculate the water consumption of individual samples. The data obtained contribute to assessing the water consumption needs on Roman construction sites, what associated logistics these volumes required, and what the technicalities of applying this specific type of lining were.

The Tyrolean ice mummy known as Ötzi presents some of the earliest direct evidence of tattooing in the human past. Despite decades of study, it remains unclear how the Iceman's tattoos were created and what tools and methods were used. Popular discussions of the Iceman describe his tattoos as having been made by incision, first cutting the skin and then rubbing in pigment from the surface. The authors review the scholarly literature on the Iceman's tattoos and summarize ethnographic, historic, and anthropological research on global patterns of tattooing to contextualize the Iceman's marks within pre-electric tattooing traditions. The results of recent experimental tattooing studies are then compared to the physical signature of the Iceman's marks to evaluate existing claims and provide informed hypotheses as to how those tattoos were created.

Raw materials from aquatic environments were systematically used for domestic activities even before the appearance of modern humans. Here, the authors analyse the possible use of freshwater mussel valves of the Unio species, whose surfaces preserve marks resulting from their use. They consider the ways in which wear develops on these valves, starting from the comparison between archaeological exemplars and experimental pieces. An experimental programme was developed to record variables such as the procurement of the raw material, the processing of various materials, and the time needed for each operation. Experimental pieces were assessed to document how use-wear develops. The archaeological assemblage from the site of Cheia in Romania (Hamangia culture, fifth millennium cal bc) served as a case study to illustrate the relevance of the results.

In this article we present an experimental approach focused on bipolar core technology. The main goal is to define the major constraints and parameters faced when identifying the bipolar component of the Early Pleistocene site of Vallparadís (Spain). For these experiments we have used the same varieties of raw materials and blanks as those documented in the archaeological record. The methodological framework applied in the study of the experimental sample is largely based on the most diagnostic parameters recurrently cited in bipolar-related literature: double striking platforms and opposite battering damage. This information has been encoded by grouping blanks, cores and detached elements in morphotechnical types. The results suggest that the reduction process is conditioned by the morphology and fracture consistency of the knapped nodules. Although blank morphology does not categorically determine the final shape of the cores and flakes, there is a clear correlation between them. The most diagnostic parameter for identifying bipolar objects in statistical terms is the presence of opposite battering damage. However, there are many non-diagnostic pieces generated throughout the bipolar knapping process. Hence we consider it pertinent to analyse the archaeological assemblage of Vallparadís according to alternative methodological approaches (e.g. morphotechnical types).

Textile research has become an important field of archaeology. Although the established analytical methods are often viewed as specialized, their integration with other interdisciplinary approaches allows us to deal with broader archaeological issues and provides the interpretational base for a much more comprehensive investigation of textiles in ancient times. Analyses of fibres, dyes, archaeobotanical and archaeozoological remains, as well as palaeoenvironmental and geochemical investigations, provide information about available resources, while tool studies, experimental testing, and visual grouping are approaches that explore the technology and techniques. Together, these approaches can provide new knowledge about textile production and consumption and, thereby, about people and society in ancient times.

The widespread employment and acceptance of use-wear analysis on materials such as flint and bone has not been accompanied by a parallel development in archaeometallurgy. This article explores its potential and problems through the investigation of socketed axes in eastern Yorkshire, in England and south-east Scotland during the late Bronze Age. Experimental work on modern replications of socketed axes was compared with wear traces on prehistoric socketed axes. The results indicate that prehistoric socketed axes had been used as multi-purpose tools, but that the nature and extent of their uses before deposition varied considerably. By combining use-wear analysis with contextual information on socketed axes in the late Bronze Age landscape, ideas concerning their significance can be explored.