Will this make a big mess?

I worry about dyed water on the table. It usually stays tidy if you use a tray or towel and fold the paper towels so they sit cleanly between cups. Small drips happen when the towels first soak. Blot spills right away with a damp cloth. If you expect fidgety kids, set the whole tray on a washable surface or outside.

How old should kids be to try this?

Young preschoolers enjoy watching the colors and helping with simple steps if you help fold the paper towels and pour the water. Around age four they can do parts of it with supervision. Older kids can manage the whole setup themselves and take measurements or drawings. Stay nearby the first few minutes so the strips sit properly.

Can I use powdered food coloring or paint?

Liquid food coloring works best because it dissolves instantly and travels easily. Powdered colors may not dissolve well and could clog the towel fibers. Paints could be thicker and will not wick like water. For safe, clear results, stick to liquid food coloring.

What if the colors don’t mix into pretty new colors?

Sometimes the colors blend slowly or look muddy if you use too much dye or shallow water. If the result looks off, refill and try with smaller amounts of food coloring. Expect variation and treat it as part of learning. Often a second run with adjusted amounts gives the bright, clean mixes you want.

How long can I leave it before cleaning up?

Thirty minutes gives a good result, but leaving it an hour or two deepens colors. Avoid leaving it overnight near pets or small children. Rinse cups soon after to prevent lingering stains and toss used towels.

Easy Walking Water Experiment 2026

Walking Water Experiment

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A fun and colorful science experiment for kids that demonstrates capillary action using simple household items.

Author: linda-harper
Prep Time: 10 minutes
Cook Time: 30 minutes
Total Time: 40 minutes
Yield: 1 experiment 1x
Category: Science Experiment
Method: Demonstration
Cuisine: N/A
Diet: N/A

Ingredients

Scale

6 clear cups or jars
Water (tap water works fine)
Liquid food coloring (red, yellow, blue)
3 to 6 sheets of paper towels
Tray or towel (to catch drips)
Measuring cup or pitcher (optional)

Cook Mode Prevent your screen from going dark

Instructions

Arrange six clear cups in a line with a small gap between each on a tray or towel.
Fill cups 1, 3, and 5 about two-thirds full with water, leaving cups 2, 4, and 6 empty.
Add three drops of food coloring to the filled cups and stir gently.
Fold the paper towels in half lengthwise and then in half again.
Place one end of a paper towel strip into cup 1 and the other end into cup 2, repeating for the rest of the cups.
Watch the colored water move up the paper towels into the empty cups.
Leave the setup for at least 30 minutes and observe color mixing.

Notes

Use thicker paper towels for faster wicking and thinner for a slower effect. Ensure a gentle arch of the towel with both ends resting in the cups.

Nutrition

Serving Size: N/A
Calories: 0
Sugar: 0g
Sodium: 0mg
Fat: 0g
Saturated Fat: 0g
Unsaturated Fat: 0g
Trans Fat: 0g
Carbohydrates: 0g
Fiber: 0g
Protein: 0g
Cholesterol: 0mg

Find it online: https://www.diymadeeasy.com/walking-water-experiment/