Before revision: The fabric of the glass itself, the paint or stain used to decorate it, and even the metal framework used to hold the design together are all at risk for deterioration, and will likely require conservation work to ensure their long-term survival.
After revision: The fabric of the glass itself, the paint or stain used to decorate it, and even the metal framework used to hold the design together are all at risk of deterioration, and will likely require conservation work to ensure their long-term survival.