Rainbow Science Experiments Photo Ideas

Children are naturally drawn to bright, vivid colours, which makes rainbow-themed science experiments instantly engaging and relatable. Because colours are part of their everyday world—seen in toys, clothes, art, and nature, rainbow experiments provide a familiar entry point into scientific exploration.

These activities spark curiosity and wonder by showing how ordinary materials can transform into extraordinary displays of color. Whether it’s watching water “walk” across paper towels, seeing milk swirl into rainbow patterns, or layering liquids into a colorful tower, children experience science as something magical yet understandable.

Benefits For Children

Rainbow experiments also encourage:

Exploration: Children test, observe, and discover how colors move, mix, and change.
Prediction & Problem-Solving: They guess outcomes and compare them with real results.
Connection to Real Science: Concepts like absorption, density, and light refraction are introduced in playful, age-appropriate ways.
Creativity & Identity: Just as every rainbow includes many colors, these experiments celebrate diversity and encourage children to see themselves as scientists.

Photo Ideas

Rainbow Science Experiment Recipes

Experiment	Ingredients	What to Do	Science Behind It
Capillary Action with Paper Towels (Rainbow Jars)	Glass jars, water, food coloring (red, orange, yellow, green, blue, purple), paper towels	Fill jars with colored water, and place paper towels bridging between jars. Wait as colors travel and mix.	Capillary action pulls water upward through paper fibers; water moves from one jar to another, mixing colors.
Plant Dye Absorption (Lettuce/Cabbage Leaves)	Glasses, water, food coloring (various colors), lettuce/cabbage leaves	Place leaves in glasses of colored water. Observe over hours/days.	Plants transport water through xylem vessels; dye travels with water, coloring leaves.
Carnations in Colored Soda Bottles	Soda bottles, carnations, food coloring or colored drinks	Place carnations in bottles of colored liquid. Watch petals change color.	Same principle as above: capillary action in xylem moves dyed water into petals.
Borax Crystal Stars (Pipe Cleaner Ornaments)	Pipe cleaners, borax, boiling water, food coloring, jars, string	Shape pipe cleaners into stars, and suspend them in borax solution overnight. Crystals grow on pipe cleaners.	Supersaturated solution deposits borax crystals as water cools and evaporates.
Fizzing Colors (Baking Soda & Vinegar Reaction)	Baking soda, vinegar, food coloring, droppers, tray	Spread baking soda and drop colored vinegar onto it. Watch fizzing foam.	Acid-base reaction: vinegar (acid) + baking soda (base) → carbon dioxide bubbles + water + salt.
Bubble Snake Blower	Plastic bottle, cloth, rubber band, dish soap, food coloring	Cut the bottle bottom, attach cloth, dip in soap solution, and blow through the top.	Soap film traps air; blowing creates bubbles. Food coloring adds a rainbow effect.
Skittles Rainbow Plate	Skittles, plate, warm water	Arrange Skittles in a circle, and pour water. Colors diffuse inward.	Sugar and dye dissolve, and diffusion spreads colors evenly toward center.
Rainbow Rain (Shaving Cream Cloud)	Clear container, water, shaving cream, food coloring	Fill the container with water, add a shaving cream “cloud,” and drop food coloring on top.	Shaving cream acts as a cloud; dye diffuses through cream into water, mimicking rain.
Oil & Water Density Experiment	Tall glasses, oil, food coloring, water	Fill glasses with oil, add drops of colored water. Watch them sink.	Oil and water are immiscible; water is denser, so it sinks, forming patterns.
Rock Candy Crystals in Jars	Jars, sugar, water, food coloring, sticks	Make a supersaturated sugar solution, pour it into jars, and suspend sticks. Crystals grow over days.	Sugar molecules form solid crystals as the solution cools and evaporates.
DIY Bouncy Balls	Cornstarch, borax, water, food coloring	Mix the borax solution, add cornstarch and glue, and knead until a ball forms.	Polymer chains cross-link, creating elastic material that bounces.
Resin/Glue Glitter Ornaments (Suncatchers)	Clear glue or resin, food coloring, glitter, molds	Mix glue/resin with colors and glitter, pour into moulds, let dry.	Resin/glue hardens, trapping glitter and dye, creating a marbled decorative effect.

By linking the joy of color with scientific processes, rainbow experiments become a powerful tool for building curiosity, confidence, and a love of learning—perfectly aligned with the spirit of the International Day of Women and Girls in Science, which celebrates inclusion and the idea that science is for everyone.