Day 1: Alien Slime Lab
Welcome to Day 1.
Today you build something that scientists still argue about — a substance that's not quite liquid, not quite solid, and acts a little bit like it's alive. You'll mix it, customize it, test it, and take it home.
Slime is the weirdest thing in any kitchen. It is not a liquid. It is not a solid. Scientists call it a non-Newtonian fluid — it changes behavior depending on how fast you touch it.
Punch it: it's solid. Pull slowly: it flows like syrup. Same material, two completely different responses depending on force and speed.
Here is why: the glue contains long, tangled molecules called polymers. When you add the contact solution, those polymer chains cross-link — they grab each other and form a stretchy net. Push fast, the net resists. Pull slow, the net slides apart and lets your finger through.
Here's what's happening at the molecular level — the atoms, the polymer chains, and how borate ions lock everything together:
Each of you makes your own batch. Follow the recipe in order, take your time on the mixing, and customize at the end.
- White school glue
- Baking soda
- Contact lens solution (must contain boric acid + sodium borate)
- Mixing bowl + stirring stick
- Measuring cups + tablespoon
- Food coloring
- Glow-in-the-dark powder
- Optional add-ins: iron oxide powder, foam beads, glitter
- Zip bag or container to take it home
- Pour 3/4 cup of white glue into your mixing bowl.
- Add 1/2 tablespoon of baking soda. Stir until fully mixed in.
- Add a few drops of food coloring and/or a small scoop of glow-in-the-dark powder. Stir until the color is even.
This is the chemistry moment. The contact solution is what cross-links the polymer chains.
- Measure 1 1/2 tablespoons of contact lens solution.
- Pour it slowly into the bowl while you stir.
- Keep stirring. Watch the mixture pull away from the sides of the bowl. That moment — when it lifts off the walls — is the polymer network locking in. Stop stirring when it forms a single mass.
Take the slime out of the bowl and knead it with your hands. It will feel sticky at first.
- Too sticky? Add a few more drops of contact solution and keep kneading.
- Too stiff? It's done. Stop adding activator.
Once you have a stretchy, mostly-non-sticky texture, pick a variant:
Time to prove the non-Newtonian thing for yourself.
- Pull slowly — it stretches like taffy.
- Pull fast — it snaps like cold cheese.
- Roll it into a ball and tap it on the table — solid.
- Set the ball down and wait — it slowly spreads into a puddle.
- Poke it fast vs. slow — feel the difference.
Same material. Different forces. Different behavior. That is what non-Newtonian means.
Your slime is built on a specific ratio.
3/4 cup of glue equals 12 tablespoons. You added 1.5 tablespoons of contact solution.
Why does this ratio matter? Too much activator → stiff, broken slime. Too little → soup. Chemists tune ratios like this in real labs to design plastics, rubber, paints, adhesives, and yes — slimes.
If you wanted to make twice as much, you'd scale everything by 2:
- 1.5 cups glue
- 1 tablespoon baking soda
- 3 tablespoons contact solution
The ratio stays the same. That's how recipes scale — and how real chemists scale a lab discovery up to mass production.
- What did your slime do that surprised you?
- If you added an extra (magnetic, glow, foam beads), how did it change the texture or behavior?
- What other everyday material might be a non-Newtonian fluid? (Hint: ketchup, cornstarch + water, quicksand.)
Store your slime in a sealed zip bag or airtight container. It'll keep for about 2 weeks at room temperature. If it dries out, knead in a few drops of water.
Don't leave slime on fabric, carpet, or wood surfaces. Dried slime is hard to remove. Hot water + a little vinegar gets it out of clothes if it happens.
Cleanup at your station: wipe the bowl and stirring stick with paper towels first, then rinse. Slime in the sink will clog a drain.
What you just did — combine simple chemicals to engineer a substance with specific properties — is the entire job description for materials scientists and chemical engineers.
- Polymer chemist — designs new plastics, rubbers, and gels. Companies: Dow, DuPont, 3M.
- Cosmetic chemist — formulates the texture of lotions, shampoos, lipsticks. Companies: L'Oréal, Estée Lauder.
- Food scientist — engineers the texture of ice cream, yogurt, ketchup (all non-Newtonian, just like your slime).
- Biomedical engineer — designs hydrogels for wound dressings, contact lenses, and drug delivery systems. Your slime is in the same chemistry family.
- Forensic chemist — analyzes mystery substances at crime scenes using polymer ID techniques.
- Materials engineer at NASA — develops the gels and adhesives used in space suits and spacecraft.
Most of these careers start with a bachelor's in chemistry, chemical engineering, or materials science. Community college can be a low-cost first step — many start with 2 years at a CC and transfer to a 4-year program.
Before you leave, share one word that describes your slime — or your day. Just one.
Great Day 1. You did real polymer chemistry, you understand why slime confuses physicists, and you have your own batch to take home. See you tomorrow.