Course Outline

Goal

This seminar will provide a review of the applied scientific data relevant to the yellowing and removal of aged resins using organic solvents.

Description

Yellowing and removability data of old and new resins will be reviewed, two- and three-dimensional solubility systems examined, and participants guided in the use of solubility charts. One-dimensional approximations and their shortfalls will be addressed, and the role of evaporation, capillarity dissolution, and swelling discussed. Varnish resins, drying oils, pigments, adhesives, and aging processes will be reviewed in-depth.

Learning Outcomes

Upon completion of this seminar, participants will be able to:

• place the varnish yellowing literature in perspective
• understand the large role of varnish thickness in rate of yellowing when judged by eye
• understand when removability is due to dissolution and when it is abrasion of a gel
• understand the strengths and weaknesses of the various solvent parameter systems that have been used in conservation, and how to apply these systems

Target Audience

Practicing conservators who want to refresh their knowledge of the stability of resins used in conservation, especially those used as varnishes

Note: This seminar presumes familiarity with the issues, the common techniques, and graphical presentation of data.