Assessing gels for varnish removal on works of art on paper

This contribution aims to detail a comprehensive approach to assessing the functionality, applicability and effectiveness of the cleaning materials produced within the GREENART project. The different steps encompassing the pre-treatment documentation, cleaning applications, and post-treatment examination are presented. Non-destructive techniques have been used to gather information on the condition, the outcomes of applications and their impact on the media and support of the artworks. This included VIS and UVL imaging in different modes, colorimetry, glossimetry and opacity measurements. Within the framework of the GREENART project, the application of gels has been employed for varnish removal from prints on paper. Varnish removal can be a complex and challenging process considering its effects on printed or coloured media, as well as the paper support. The gels exhibited varying behaviours when combined with different solvents and cleaning fluids, as well as differing effects on the varnish layer. Assessment of GREENART gels provided the opportunity to re-consider the criteria and objectives of treatment. The outcome of the trials will be presented and discussed, offering new insights into varnish removal techniques in paper conservation.