Hello, fellow scientists. Today we’re going
to learn about colours.
What are the colours of the rainbow? Red,
Orange, Yellow, Green, Blue, and Purple. But
here, we have just red, yellow, and blue.
These are called Primary Colours.
How can we get the other colours?
By MIXING primary colours together.
First, we’re going to make PURPLE. I love
purple. Purple is the colour of grapes, and...
flowers. To make purple, we’re
going to mix red and blue.
I have here a glass of water.
I’m going to add a splash of milk
just so it’s easier to see the colours.
Now let’s add a few drops of red...mix it
up, and now a few drops of blue...mix it together..
Mix it together and what do we get?
PURPLE! RED PLUS BLUE MAKES
PURPLE.
Yes, tastes like purple.
Next let’s make GREEN. Green is the colour
of grass, and ... broccoli.
Everyone loves broccoli, right? (Nod, you're mom's watching)
So how are we going to make green? We’re going
to mix blue and yellow.
Once again, we have our glass of water.
Add a little milk. Now, I’ll add
a few drops of yellow...,
and then a few drops of blue.
Give it a good mix, and we get...GREEN!
YELLOW PLUS BLUE MAKES GREEN.
Just as I suspected!
Smells like green.
Next we’re going
to make ORANGE. Orange is the colour of...
oranges!
Sounds appropriate.
Water....milk...
I’ll start with some drops of red,
and add some drops of yellow. Mix it together,
and we get ORANGE! RED PLUS YELLOW MAKES ORANGE.
Yes, sounds like orange.
There, we’ve created our own rainbow.
Red,
Orange, Yellow, Green, Blue, Purple.
Actually,if you look really close, you can see I left
a colour out. There’s another colour in
the rainbow. It’s kind of a dark purplish
blue. Do you know what it’s called?.....that’s
right. Indigo. Like the colour of blue jeans.
Where would indigo go?
I think it goes here, between blue and purple.
Do you know how we make indigo?  Think. Think think think. With your brains!
We made orange by mixing red and yellow. We
made Green by mixing yellow and blue. How
do you think we’ll get Indigo? ... Based
on our previous observations, I have a HYPOTHESIS.
That’s better than a guess. It’s more
like an “educated guess,” because it’s
based on what we know. I think - I hypothesize
- if we mix these two neighboring colours,
we’ll get the colour in the middle. Let’s
try it. Let’s mix blue and purple and see
if we get indigo. When you make a hypothesis
and then test it - that’s an EXPERIMENT!
Look at us, doing science together.
Here’s a fresh glass. Let’s pour in half
of our blue water and half of our purple water.
What do you see? INDIGO! BLUE PLUS PURPLE
MAKES INDIGO. Our hypothesis was correct.
Now we have our complete rainbow!
Red, Blue, and Yellow are called Primary Colours
because they can’t be made by combining
any other colours. Orange, Green, and Purple
are called Secondary Colours (because they’re
made from Primary colours). And Indigo is
a Tertiary colour because it’s made from
primary and secondary colours. It’s the
only tertiary colour in the rainbow.
Okay, that’s all the
science we have time for today.
Go make a big mess. Just kidding.                               Don’t make a mess. Bye.
