Research on mechanical properties of ground suitable for metalpoint

Analysis and consideration of the effect of medium on the scratch hardness and ground adhesion

Abstract

Ground preparation is one of the most important steps when working with a metalpoint. This study aims to clarify the conditions of the ground suitable for metalpoint and systematize them based on scientific evidence. Experiments and investigations were performed, particularly focusing on the surface hardness.

Previous research has reported that the relationship between the density and clarity of drawn lines and the Mohs hardness of the pigments in the base are the conditions for a suitable base for metalpoint. However, more quantitative research on surface hardness has seldom been performed. Therefore, in this study, bases were created using six types of media and the strength of each coating was tested using specialized equipment. The research method involved two types of scratch hardness tests and two types of adhesion tests between the coating film and support.

Comparison and consideration of the scratch hardness and adhesion of each ground revealed that the acrylic resin emulsion had excellent coating strength. Furthermore, when drawing was performed using metalpoint on the six different types of ground, it became evident that the stronger the base paint film, the darker and clearer the drawn lines. The results of this research can create a foundation for clarifying the conditions of the ground suitable for metalpoint and systematizing them based on scientific evidence.