Before revision: Basic conservation philosophy In J. Sloan's discussion of stained glass conservation in the United States, the author gives the following list of ethical and philosophical criteria to be applied to the conservation of stained glass (Sloan 1993, 13): All materials and procedures should be reversible without affecting the piece... .
After revision: Basic conservation philosophy In J Sloan's discussion of stained glass conservation in the United States, the author gives the following list of ethical and philosophical criteria to be applied to the conservation of stained glass (Sloan 1993, 13): All materials and procedures should be reversible without affecting the piece... .