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↳ Is this connected to that? Use a homemade electronic tester to find out if electricity can flow between two objects. To perform the test, use a dropper to add one or two drops of iodine to each type of food.↳ Investigating the 'Mpemba Effect': Can Hot Water Freeze Faster than Cold Water?.↳ From Dull to Dazzling: Using Pennies to Test How pH Affects Copper Corrosion.↳ Forensic Science: Building Your Own Tool for Identifying DNA.↳ Electrolyte Challenge: Orange Juice vs.↳ Do Oranges Lose or Gain Vitamin C After Being Picked?.↳ Math & Computer Science Sponsored by Hyperion Solutions Corp.↳ Grades 9-12: Getting Ready for the Science Fair.↳ Grades 6-8: Getting Ready for the Science Fair.↳ Grades K-5: Getting Ready for the Science Fair.↳ Science Teachers: Fairs, Projects, and General Support.↳ Advanced Science Competitions (Intel ISEF, Intel STS, Siemens Competition, JSHS, etc.).↳ Grades 9-12: Math and Computer Science.↳ Grades 9-12: Life, Earth, and Social Sciences.↳ Grades 6-8: Math and Computer Science.↳ Grades 6-8: Life, Earth, and Social Sciences.↳ Grades K-5: Math and Computer Science.↳ Grades K-5: Life, Earth, and Social Sciences.Active Forums (Make all new posts here).That's weird the chemical already worked with the banana though. It sounds like there is some inherit variability in the pears, so it might have to do with the location your running the test. As with any indicator of fruit maturity, the starch-iodine index should be used in combination with other maturity tests" As a guide, fruit destined for storage should be harvested at a starch-iodine index of 4 to 5, whereas fruit for immediate sale should be harvested at an index of 6 to 7. The starch index at which fruit should be harvested depends on the intended length of storage. These patterns will be slightly different for each variety. As fruit mature, starch clears from the core first, followed by the cortex.
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The starch patterns will develop in approximately 1 minute. Fruit should be cut in half through the equator and the cut surface dipped or sprayed with the iodine solution from a plastic spray bottle. Providing the container is well stoppered, the solution will keep for long periods of time. This solution should be stored in a plastic or glass container as it is corrosive to metals. During mixing and use of this solution, make sure the area is well ventilated-iodine fumes are toxic. A solution of 10 grams of potassium iodide and 2.5 grams of iodine in 1 liter of water should be used. Iodine turns starch black therefore, an iodine solution can be used to determine the amount of starch remaining in the fruit. "Starch-iodine Testing: As fruit mature, starch is converted to soluble sugars. I'm not sure how different this protocol is from the one you've been using but I attached one I read below:
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