Natural mineral pigments are not inherently permanent. Particle size, binders, support, light, and humidity all affect long-term condition; care guidance for a real work should be based on its actual materials.
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Clear documentation of materials, dimensions, lighting, and environmental conditions is more helpful in understanding a work than general judgments. This article is a demonstration and is not intended to be a substitute for professional advice in the fields of religious history, materials science, restoration, or appraisal.
"Time is not something outside the work, it exists between every coloring and waiting."
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