How do you write in colour?

So wait, what's the right code? I can't figure this out 

 

[colour=a colour] boom [/colour]

 

Oh, that was stupid of me

[rainbow=rainbow] rainbow ? [/rainbow]

 

First, it's COLOR. I don't think forums accepts colour. :/ Heck, autocorrect didn't.

Second.

It's:

[
color
=
Purple
]

*text*

[
/
color
]

Gets? 

 

Do that horizontally. 

 

Oh right... Thank you

 

yellow

 

hi

 

Booooo[/white]

 

blue [/red]_

 

blue

 

testing [/green]

 

green

 

Testing 

ToxiiC

ToxiiC

ToxiiC

 

Testing 

ToxiiC

ToxiiC

ToxiiC

 

Crimson [/colour]

 

Crimson

 

blue

 

my favourite color

 

This will be an epic failure :3