What colour is a black marker?

Today in Year 4 Science Club we were learning about what colours a black marker pen is made from.

First we cut out a circle of filter paper and cut a tiny hole in the middle.

Then we put a wet pipe cleaner down through the hole and into a cup of water.

We watched to see what happened.

We saw that the colours started to separate out of the black ink and spread out onto the paper.

 Where did the colours come from?  

 We think that the colours came from the black felt tip pen.  Black is made from lots of colours mixed together.