The coin sits on top of the solid ice. If the power goes out and the freezer warms up, the ice will begin to melt. The coin will sink as the ice melts. Even if the power comes back on and the water refreezes, the coin will
How to Interpret the Results When You Return
| The Coin’s Position | What It Means | What You Should Do |
|---|---|---|
| 🪙 On Top | The freezer stayed frozen the entire time. No prolonged power outage occurred. | Your food is SAFE to eat. |
| 🪙 In the Middle | The power was out long enough for the ice to melt partially, but it refroze. | Use CAUTION. The food may be partially thawed. Check items carefully. When in doubt, throw it out. |
| 🪙 At the Bottom | The ice melted completely and the food fully thawed before the power returned. | Your food is UNSAFE. Throw away perishable items to avoid the risk of food poisoning. |
Important Considerations & Limitations
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This is a guideline, not a guarantee. It tells you if a thaw/refreeze event occurred, but you should still use your senses (smell, texture) and a food thermometer to check individual items.
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A full freezer will stay cold longer. A freezer that is mostly full can keep food frozen for about 48 hours during a power outage. A half-full freezer may only last 24 hours.
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It doesn’t prevent outages, but it gives you the information you need to make a smart decision about your food’s safety.
This is a fantastic, low-cost life hack that everyone should use, especially before going on vacation. Share it with your friends and family—it could prevent someone from getting sick!
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