Experimental procedures. Chemical 1. Potassium permanganate. 2. Ground roasted rice. 3. Finely ground charcoal. 4. Powdered chalk ground. 5. White ash. Materials - Equipment. 1. Bananas. 2. Plastic bags. 3. Papers. 4. Rubber band. 5. White cloth. 6. Weighing machine 7. Thermometer 8. Label paper 9. keeping box of bananas