Turning grapes into raisins

Contributed by : Ravina Sewani   
Turning grapes into raisins


This activity is an early and interesting exposure to science.

Things you will need: grapes, bowl

How to:

  1. Remove the larger stems from your grapes and wash them thoroughly with water.
  2. Spread the grapes out evenly so that they aren't touching each other on a baking tray and cover them. You can use a wooden, wicker, bamboo, or plastic tray that is slatted, so air can circulate around the fruit. Use a kitchen towel to cover the grapes.
  3. Your cover should be effective at keeping insects away from your grapes. Make sure that whatever you use to cover the grapes won’t get blown away in the wind. If your cover is light, you may need to weigh it down on its corners.
  4. Place the tray outside in the sun during warm, dry weather. Put the tray in a location where it will get lots of sunlight during the day. The warmer and dryer the climate (temperature is at least 75 °F (24 °C)), the easier your grapes will dry out.
  5. If your area gets foggy or dewy at night, take the tray inside at the end of the day and place it outside again the next morning.
  6. Allow the grapes to sit outside for 3-4 days, rotating them occasionally. The grapes may take up to 96 hours to become sufficiently dry. However, they should be left outside for at least 3 days. Rotate the grapes twice each day to make sure the grapes are completely exposed to the sun.
  7. After 3 days, feel free to conduct a taste test on 1 or 2 of the grapes to see if they’re sufficiently dry. If they’re to your liking, go ahead and bring them inside. If they’re not quite dry enough, leave them out for another day.
  8. You can leave grapes out in the sun for up to 5 days, though you shouldn’t need to leave them out any longer than this.
  9. Take the dried raisins inside and store them in an airtight container. Store the container in a cool place or refrigerate them. Suggested storage containers for air-dried raisins include mylar bags, tupperware, and glass canning jars with an oxygen absorber.

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