Will this make a huge mess in my kitchen?

I do not want salt everywhere. You can keep this tidy by working on a tray or a washable mat and using small jars for the solution. Salt tends to stay in one place and brushes up easily, and a coffee filter catches most undissolved bits. If a spill happens, a damp cloth wipes it up quickly. I often set a towel under the kids’ workspace and they clean up like it is part of the fun.

Is this safe for younger kids?

How old should they be? Young children can help shape bases and press spikes at a table with supervision, but I recommend adult help for hot water or if you choose borax. For fully child-led work, use the baking soda method with warm, not boiling, water. If you use borax, put on gloves and goggles and handle hot water yourself. We have done this with kids as young as five when adults manage the hot steps and children do the dipping and watching.

What if I do not have borax?

Can I still get nice crystals? Yes. Table salt or Epsom salt make pretty crystals too; the shapes just differ. The baking soda method gives large, sparkly growths with a little patience. If you want a no-borax pathway, try the baking soda ratio and expect slower but still lovely results. For tips on no-borax techniques, our other projects show how to coax good crystals using safer salts.

How long will these keep and can I gift them?

When fully dry and kept away from humidity, Rainbow Crystal Urchins can last many weeks or months as decorative pieces. For gifting, package them in a small box with tissue and a note about keeping them dry. If crystals chip in transit, you can brush loose bits off and reseal with a thin glue coat to restore sparkle.

Easy Rainbow Crystal Urchins 2026

Rainbow Crystal Urchins

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A fun and engaging project to create beautiful Rainbow Crystal Urchins using simple materials and a bit of patience.

Author: linda-harper
Prep Time: 20 minutes
Cook Time: 0 minutes
Total Time: 240 minutes
Yield: 4-6 urchins
Category: Craft
Method: DIY Craft
Cuisine: N/A
Diet: N/A

Ingredients

Air-dry clay or lightweight salt dough
Thin wooden skewers or toothpicks
Fine sand or a textured stamp (optional)
Table salt, Epsom salts, or borax
Warm water
Food coloring or liquid watercolors (optional)
Clear glue or PVA (optional)
Small jars or shallow dishes
Tweezers and small paintbrush
A fine sieve or coffee filter
Paper towels and a tray
Protective gloves and goggles (recommended if using borax)

Cook Mode Prevent your screen from going dark

Instructions

Prepare your base by rolling a small ball of air-dry clay until smooth and pressing one side flat.
Mark where spikes will go using a skewer.
Insert spikes by pushing toothpicks or skewers into the holes.
Let the base dry until firm, which may take 12 to 48 hours.
Mix your crystal solution based on the method chosen.
Optionally color the solution with food coloring.
Dip the urchin in the crystal solution.
Wait and watch the crystals form, checking periodically.
Rinse the urchin if using borax or Epsom salt and let it dry completely.
Finish by optionally brushing a thin layer of clear glue over the crystals for extra shine.
Display your Rainbow Crystal Urchins in a bright spot to enjoy their beauty.

Notes

Adult supervision is recommended when handling hot water and borax. Always prioritize safety when crafting with children.

Nutrition

Serving Size: 1 urchin
Calories: N/A
Sugar: N/A
Sodium: N/A
Fat: N/A
Saturated Fat: N/A
Unsaturated Fat: N/A
Trans Fat: N/A
Carbohydrates: N/A
Fiber: N/A
Protein: N/A
Cholesterol: N/A

Find it online: https://www.diymadeeasy.com/rainbow-crystal-urchins/