期刊名称：WAAC Newsletter / Western Association for Art Conservation
电子版ISSN：1052-0066
出版年度：2007
卷号：29
期号：3
出版社：Western Association for Art Conservation (WAAC)
摘要：The Modular Cleaning Program (MCP) was originally conceived to assist the conservator in the formulation and selection of aqueous cleaning systems. Upon using th e sys- tem, it became apparent that many of the advantages of the approach could also be ap plied to both solvent gels and free solvents. The two overarching principles of the MCP are the use o f small amounts of sto ck solutions that can be mixed to make a large nu mber of test cleaning solutions and the use o f physical constants as a basis for all calculations. The conservator decides on a cleaning strategy and uses the p rogram to work though variables to determine the optimal cleaning system. The computer takes care of the bookkeeping issues associated with formulating complex mixtures. The software provides a context showing which parameters may b e ch anged in a cleaning, and the conservator cho oses the d irection of the testing. Using small volumes of test solutio ns o ffers advantages in cost, ecological impact, and heath and safety by minimizing exposure and waste. The speed and ease with which test solutions can be formulated allows many more cleaning o p- tions to be tested and evaluated than was previously practi - cal when each test solution had to be made from scratch. This paper will focus on the design of the solvent and solvent g el capabilities of the program, which will enable a conser- v ator to approach a cleaning using a mixture of free solvents o r a set o f stock solvent gels that can be mixed together. The MCP incorporates a new theory for formulating solvent g els. The theory, based on empirical observation, po stulates p hysical-chemical structures for Carbopol-based gels. These structures have been used to calculate the gel formulations. A group of solvent gels has been integrated into the new g raphical display of solvent parameters, allowing the con- servator to navigate visually through th e selection of gel combinations. These features are not fully integrated into the current version of the MCP, b ut are included in the next v ersion which is bein g debugged as you read this. The clearance o f Carbopol-based gels will also be addressed within the database. Recommendations for clearance mixtures will be based on the solubility range of the Carbopol/amine p resent in the gel or gel mixtures and are calculated in Han- sen Solubility Space. As yet, this feature is n ot incorporated into the database, but research is ongoing.
