Support for PBS Parents provided by:

  • Arthur
  • Cat in the Hat
  • Curious George
  • Daniel Tiger
  • Dinosaur Train
  • Let's Go Luna
  • Nature Cat
  • Odd Squad
  • Peg + Cat
  • Pinkalicous and Peterriffic
  • Ready Jet Go
  • Splash and Bubbles
  • Super Why!
  • Wild Kratts
  • Sesame Street
  • Ruff Ruffman Show
  • Mister Rogers
  • Cyberchase
  • SciGirls
  • Sid the Science Kid
  • Martha Speaks
  • The Electric Company
  • WordGirl
  • Caillou
  • Oh Noah
  • Fizzy's Lunch Lab
  • Maya & Miguel
  • Postcards from Buster
  • Clifford
  • WordWorld
  • DragonFly TV
  • ZOOM
Dinosaur Discoveries

A Colorful Hypothesis

Apply the term "hypothesis," and investigate the science of color.


  • food coloring (red, blue, yellow)
  • tap water
  • 6 empty, clean baby food jars (or similar clear containers)
  • 3 eye droppers
  • rimmed cookie sheet
  • colored markers (at least 8 colors)
  • plastic spoon
  • sponge for clean up


Fill 3 empty baby food jars with water. Add enough drops of food coloring to each jar, until you have 3 jars with the primary colors: red, blue and yellow. Fill the other 3 jars with clear water. Put all materials on a rimmed cookie sheet.


  1. Ask your child if he has ever heard the word “hypothesis” before. (Most children will probably be unfamiliar with this term). Explain that “hypothesis” is a special word that scientists use for “an idea that you can test.” You could also add, “A hypothesis is a kind of prediction.” Explain that when someone makes a hypothesis, he or she uses clues to make a guess about something. Give some examples, such as, “If I drop this rubber ball on the floor, my hypothesis is that it will bounce.” Or, “When I see dark clouds in the sky, I have a hypothesis that it will rain soon.” Encourage your child to come up with a simple hypothesis or two, then ask, “How could you test your hypothesis?”
  2. Watch the Dinosaur Train video clip of Buddy proposing various hypotheses.
  3. Explain that your child will be doing an experiment with colors. He will mix different colored water together and find out what new color is made. Before your child does any color mixing – he will make a hypothesis or prediction. In other words, he will guess what the new color will be. Point out that sometimes a hypothesis is right – and sometimes it is wrong. Either way is no big deal. Remind your child that Buddy sometimes tests his hypotheses and discovers that his guess was wrong. The important thing is to make your best guess and learn from the results.
  4. Tell your child that he is going to write down all his information on a chart. Explain what each column of the chart means – Colors, Hypothesis, and Results. At some point, you may wish to point out that the plural of Hypothesis is “Hypotheses” (Hi-PAH-thuh-SEEZ). Or simply say, “Excellent Hypotheses” when your child talks about more than one color prediction.
  5. Show all the materials to your child. Explain how to use an eye dropper to remove a small amount of colored water. Let your child try one, and see if he can control the dropper to release a certain number of drops. Encourage him to squeeze out only one drop of water at a time. Take your child through the first example on the chart by asking him to predict what color will result if he mixes 5 drops of blue water with 5 drops of yellow water. Before mixing the colors ask: “What is YOUR hypothesis?” You could then paraphrase this question as, “What new color do you think we’ll get if we mix 5 drops of blue and 5 drops of yellow?” Before your child mixes the colors, you could say something like, “Time to TEST your hypothesis!” Follow the steps on the printable page to record your results.
  6. Repeat the above step with all color combinations on the chart.

Take it Further

  • As a challenge, an older child can try this experiment backwards. He can "secretly" create a new shade of colored water by combining 2 colors in different quantities (example: 5 drops of red with 10 drops of blue) – then see if you, or another child, can figure out how this color was created. Encourage your child to use the word "hypothesis" in their discussions. For example, your child might say, "My hypothesis is that you mixed red water and yellow water – but I don’t know yet which color you used more of," or, "My hypothesis is that you used more yellow water."
  • Older children can go to the library, or use the Internet, to explore famous scientific hypotheses that turned out to be wrong. (For example, many people once thought the Sun orbited, or circled, around the Earth – and now we know that Earth and all the other planets orbit around the Sun.)

You May Also Like

Produced by: Support from:
Henson Company logo “Kiddie

What's this?

PBS Parents Picks

  1. Wild Kratts image

    Wild Kratts App Teaches Young Children How to Care for Animals

    In this app, kids are charge of feeding, washing, and playing with baby animals.

  2. Curious Kids image

    How (And Why) To Encourage Curiosity

    "...when people are curious about something, they learn more, and better."

  3. Gardening Benefits image

    The Benefits of Gardening With Kids

    Don’t let the idea overwhelm you. A few containers and soil in a sunny spot will do.

PBS Parents Newsletter

Find activities, parenting tips, games from your child's favorite PBS KIDS programs and more.