Notice catalographique « Calcium phytate : a treatment for degraded tacking margins »
- Titre
- Calcium phytate : a treatment for degraded tacking margins
- Auteur ou éditeur
- Morton, Jennifer A.
- Queen's University (Kingston, Ont.)
- Lieu de publication
- Kingston, Ont.
- Maison d'édition
- Queen's University (Kingston, Ont.)
- Date de publication
- 2012
- Collation
- lxii p. : ill. ; 29 cm.
- Résumé
- Paintings constructed of linen canvas affixed to their stretcher by uncoated iron tacks are susceptible to degradation. As the tacks age and corrode, the oxidation products including iron (II and III) ions can migrate into the surrounding canvas of the tacking margin. The presence of iron (II) ions can cause the linen threads of the canvas to become brittle and acidic. This is similar to the situation encountered in paper conservation with documents containing iron gallotannate or iron gall ink. In order to simulate these conditions, linen threads were artificially rusted using a two-step aqueous chemical process involving iron (II) sulphate and ammonium hydroxide. To accelerate the aging process, threads were stored in an environment test chamber for several weeks at elevated temperatures (80°C - 100°C) and increased relative humidity (65%). Threads that had been either rusted or not, or aged or not were then treated using the paper conservation process which employs calcium phytate in conjunction with calcium bicarbonate to complex the active iron (II) ions and decrease the acidity of the surrounding material support. Randomly selected threads from the various treatment combinations were assessed for the presence of iron (II) ions and decrease the acidity of the surrounding material support. Randomly selected threads from the various treatment combinations were assessed for the presence of iron (II) ions (bathophenanthroline test strips), their acidity (pH), their tensile strength (Tensometer) and their flexibility (Mandrel test). This study established that both the artificial rust treatment and the accelerated aging process provided an excellent simulation of linen canvas aging as evidenced by the reduction in the tensile strength of the threads. In addition, the calcium phytate and calcium bicarbonate treatment did reduce the concentration of iron (II) ions, but did not impart any increase in the threads’ tensile strength though there was some evidence of improved flexibility.
- Notes
- Thesis (M.A.) -- Queen's Univeristy, 2012
- Langue
- English = Anglais
- Sujet
- Painting - Conservation and restoration
- Painting - Conservation and restoration - Equipment and supplies
- Peinture - Conservation et restauration
- Peinture - Matériaux
- Pays
- Canada
- Type de document
- Monograph = Monographie
- Localisation
- ND 1630 M67 2012
- Clé
- 17050
- Collection
- Catalogue