Materials & equipment1. glass jar or jars. Container for Dong2.1 cup salt tablets Per 10 eggs, bubble3. water 4 cups or 1 litre per 10 eggs, bubble.4. fresh duck eggs 10 bubble (if adding the eggs, add the water and salt in proportion)5. boiler6. a fireplace7. plastic bags.8. rubber band9. some of the white fabric.
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