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Fireworks in a Jar: A Colorful DIY Science Craft for Kids

Children are naturally curious, especially when it comes to experiments that mix color, movement, and a little bit of magic. “Fireworks in a Jar” is a safe, hands-on science activity that mimics the dazzling burst of fireworks using just a few household items. It’s more than just a fun craft — it’s a mini science lesson about density, solubility, and chemical reactions.

Whether you’re a parent looking for a rainy-day activity, a teacher preparing a classroom science experiment, or just someone wanting to spark a child’s sense of wonder, this DIY project is a perfect blend of education and entertainment.

What Is “Fireworks in a Jar”?

This experiment uses water, oil, and food coloring to create a visual effect that resembles fireworks exploding in the sky. When food coloring is added to oil, it doesn’t mix right away — it suspends in tiny droplets. But when this oil is poured into water, the food coloring bursts through, creating beautiful, slow-motion streaks of color that look like mini fireworks!

Materials Needed

All the supplies can likely be found in your kitchen:

A clear glass jar or tall glass
Warm water (¾ of the jar)
Vegetable oil (2–3 tablespoons)
Food coloring (multiple colors for the best effect)
A small bowl or cup
Fork or spoon (for mixing)
Paper towels (for easy cleanup)

Step-by-Step Instructions

Step 1: Fill the Jar with Warm Water

Fill the clear jar or glass about three-quarters full with warm water. The warmth helps the food coloring move more dramatically through the water and speeds up the process slightly.

Step 2: Prepare the Oil and Food Coloring Mixture

In a separate small bowl or cup, pour about 2 to 3 tablespoons of vegetable oil. Then, add several drops of different food coloring to the oil — 4–5 drops of each color is ideal. The more colors you use, the more striking the final effect.

Pro Tip: Use vibrant colors like red, blue, yellow, and green for the best fireworks display.