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DIY Crystal Seashells

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Create beautiful crystal formations on seashells using a simple process that combines warm water and borax or alum.

Ingredients

  • Clean seashells, rinsed and dried
  • Borax powder or alum
  • Hot water, just off the boil
  • Small glass jars or heatproof containers (one per shell or cluster)
  • Clear string or thin wire for suspending shells (optional)
  • A spoon or stir stick
  • Food coloring or liquid dye (optional)
  • A tray or towel to protect your work surface
  • Gloves and goggles (recommended for safety)
  • A fine brush or soft cloth for gentle cleaning

Instructions

  1. Gather a calm workspace and lay down a towel.
  2. Measure hot water into a jar, enough to fully cover the shell.
  3. Add borax or alum slowly, stirring until the solution is saturated.
  4. Prepare the shell by rinsing and letting it dry completely.
  5. If suspending, tie the shell with string or hang it in the jar.
  6. Lower the shell into the solution gently and leave undisturbed.
  7. Wait for the first tiny crystals to appear, usually within a few hours.
  8. When crystals look full, gently remove the shell and rinse with cool water.
  9. Let the shell dry completely on a paper towel.
  10. If desired, return the shell to a fresh saturated solution for deeper growth.

Notes

Borax is recommended for clearer crystals, while alum can create different textures. Always handle borax carefully – it’s not safe for ingestion.