🧪 Fresco Reactions Mini-Lab

Students examine teacher-prepared sample tiles and wet-plaster demonstrations showing pigment, binder, and plaster combinations that cracked, faded, or adhered differently. Using hand lenses, pH strips, and observation charts, they record at least three visible changes and sort them as likely physical change, possible chemical reaction, or uncertain. The class closes by listing mural-durability puzzles that could become investigable questions.