Notice catalographique « A preliminary evaluation of mineral-spirit-borne retouching or isolating mediums for sensitive unvarnished acrylic emulsion paint »
- Titre
- A preliminary evaluation of mineral-spirit-borne retouching or isolating mediums for sensitive unvarnished acrylic emulsion paint
- Auteur ou éditeur
- Lam, Pui Yee
- Queen's University (Kingston, ON)
- Lieu de publication
- Kingston, ON
- Maison d'édition
- Queen's University
- Date de publication
- 2022
- Collation
- vii, 59 pages : illustrations (chiefly colour), charts, tables
- Série
- Queen's Master in Art Conservation
- Résumé
- This research evaluated four potential mineral-spirit-borne retouching systems for their suitability for retouching unvarnished acrylic emulsion paint surfaces. Golden MSA Conservation Paint was tested directly on acrylic paint surfaces, while the resin, Plexigum® PQ 611, was tested mixing with pigment; and one varnish and one resin, Golden MSA Varnish with Satin and Regalrez® 1094, were applied as an isolating layer for water-based retouching on top. Expanding upon previous research on mineral-spirit-borne mediums, this research investigated the potential optical, microscopic, and chemical effects on the surrounding original paint layer caused by the staining or leaching of the retouching mediums during application and removal. Two acrylic emulsion paint products, the Golden Acrylics SoFlat and Golden Acrylics Heavy Body, were chosen as the base paint because of their significant difference in surface gloss. In this research, the components of the two products contributing to the different in gloss were first accounted for and then five properties of the retouching mediums were evaluated: gloss, color, staining (during application), leaching (after removal), and reversibility. Two different experiments were designed to test these properties. The first set of experiments evaluated ease of matching the surface characteristics of gloss and color. The retouching systems were then tested for reversibility and impact of solvents on the original paint layer. The second set of experiments focused on staining behavior during application and techniques for mitigating this phenomenon. Analytical methods used for the research included gloss measurements, color measurements, photomicrographs, analysis of cross-section samples under the stereomicroscope, and attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR). The resulting semiquantitative and qualitative measurements were used to determine their suitability as retouching materials. The results identified that the system of using a mineral-spirit-borne isolation layer with water-based retouching or Golden MSA conservation paint could achieve a “knocking back” effect for retouching both the Heavy Body and SoFlat paint, but required modification with matting agents. The Plexigum retouching had a particular low gloss, which was suitable for retouching the SoFlat paint. The low molecular weight and viscosity resin Regalrez® 1094 was found to have significant spreading on this type of acrylic matte paint. Thickening agents may need to be considered in future studies. Considering reversibility, systems that could only be removed by aromatic mineral spirits caused stronger surface disruption. For this experiment, ATR-IR spectroscopy identified a low, trace amount of binder material from the base paint, detected from the swab removing the retouching layer. However, there was no noticeable amount of leached surfactant detected. Differential scanning calorimetry (DSC) and scanning electron microscopy analysis was suggested to be done in experimental setup 3 which was designed to modify the testing parameters in the future.
- Notes
- Thesis (M.A.) -- Queen's University, 2022
- Langue
- English = Anglais
- Sujet
- Varnish and varnishing - Analysis
- Painting - Conservation and restoration
- Artists' materials - Analysis
- Vernis - Analyse
- Peinture - Conservation et restauration
- Matérial d'artistes - Analyse
- Pays
- Canada
- Type de document
- Monograph = Monographie
- Localisation
- TP 938 L36 2022
- Clé
- 19930
- Collection
- Catalogue