Did you know you only need three magic colours to make almost every colour in the rainbow? It’s true! Grab your paints — today we’re going to be colour scientists and mix brand-new colours with our own hands.
🧪 What You Need
- Red paint
- Yellow paint
- Blue paint
- A white plate or palette
- A paintbrush
- A cup of water
- Paper
- An old shirt or smock
Step by Step: Let’s Mix!
What’s Going On?
Red, yellow, and blue are special because you can’t make them by mixing other paints — that’s why we call them primary colours. But you can mix them to make new ones! The new colours — green, orange, and purple — are called secondary colours.
When you blend two paints, the tiny bits of colour mix together so your eyes see one brand-new colour. The more you add of one paint, the more that colour takes charge. That’s why a little extra blue makes your green look cooler and deeper.
📖 Big Word: Primary Colours
The three starter colours — red, yellow, and blue — that mix together to make all the others.
⚠️ Stay Safe
Use only child-safe, washable paints. Keep paint out of your mouth and eyes, and ask a grown-up to help with the water cup. Wear an old shirt — colour scientists get a little messy!
🤯 Whoa, Really?!
If you mix all three primary paints together, you don’t get a rainbow — you get muddy brown! Artists use that trick on purpose to paint tree trunks and chocolate.
Make It Lighter or Darker: Tints & Shades
Once you can make green, orange, and purple, here’s how to make hundreds more colours from them:
- Add a little white to make a colour lighter. A lighter colour is called a tint — pink is really just a tint of red!
- Add a tiny bit of black to make a colour darker. A darker colour is called a shade.
With tints and shades you can turn one blue into a whole family — from pale baby blue all the way to deep midnight blue. Add just a smidge at a time, because a little goes a long way!
📖 Big Word: Tint & Shade
A tint is a colour with white added to make it lighter. A shade is a colour with black added to make it darker. Same colour — brand-new mood!
The Colour Wheel
Artists arrange colours in a circle called the colour wheel. The three primaries are spaced out, and each secondary colour sits right between the two primaries that make it — green between yellow and blue, orange between red and yellow, purple between red and blue. The really cool part? Colours sitting opposite each other (like red & green, or blue & orange) are called complementary colours. Pop them side by side and they make each other look super bright — that’s why red holly berries seem to glow against green leaves!
Mixing LIGHT Is Totally Different!
Get ready for a mind-bender. Mixing paint and mixing light don’t work the same way at all! With paint, mixing all your colours together makes muddy brown. But with light, the primary colours are red, green, and blue — and when you shine all three together, you get bright WHITE! That’s the secret hiding inside your TV, tablet, and phone: if you zoomed in super close on the screen, you’d see thousands of tiny red, green, and blue lights teaming up to make every colour you see.
🧠 Quick Quiz — tap an answer!
1. Which two colours mix to make green?
2. What do we call red, yellow, and blue?
3. What happens if you mix all three primary colours?
Frequently Asked Questions
Q: What are the primary colours?
In paint, they’re red, yellow, and blue — the three starter colours you can’t make by mixing others.
Q: What are secondary colours?
Colours made by mixing two primaries: green (yellow + blue), orange (red + yellow), and purple (red + blue).
Q: How do I make a colour lighter or darker?
Add white to make a lighter version (a tint), or a little black to make a darker version (a shade).
Q: Why do all the paints mix into brown?
Each paint soaks up some light, so mixing them all leaves very little light to bounce back — and you get muddy brown.
Q: Why is mixing light different from paint?
Light adds up instead of soaking away, so its primaries are red, green, and blue — and all three together make white, like on a screen.
📚 Where we learned this (for curious grown-ups):
• Britannica — Primary Colours & Mixing
• Britannica — RGB (Light) Colour Model
• Exploratorium — Colour & Light (The Three Little Pigments)
You Did It!
Look at you — a real colour scientist! Now try changing one thing: what if you add a dot of white to your purple? Or mix a teeny bit of blue into orange? Every change makes a new shade just for you. Keep mixing and see how many colours you can discover! 🎨
