Why does nail varnish have 2 small balls inside it?

I know it has something to do with shaking the bottle.....Why does nail varnish have 2 small balls inside it?
so it'll mix better





i've always thought it was so you can hear it's shaking up and down and no it's mixing properly... i guess that's wrong, but it reassures me. when i dont hear it i feel weirdWhy does nail varnish have 2 small balls inside it?
It's for when your nail varnish goes all different colours, like if it starts to split up (it's hard to explain) If it goes all watery, and if it's quite old it will probably do this.. just shake it and it just help to mix it back together.
it is to mix it all the chemicals inside it like there is water in there and stuff so sometimes the water flows at the top and you get a really watery vanish and its not good so when you mix it it is all right
I don't think its to do with Colour its to stop the varnish drying up and making it the right consistency not to thick or to runny . :)
Shaking it will mix the ingredients properly.
its to mix up all the stuff in them, so you don't get a bad pale colour that's uneven, you get a consistent colour
To make the colour smootehr.
It's to help mix the color
to help mix it