I am investigating the idea, and i saw how it seems it's the transactions that are colored. Can someone explain this choice to me?

Also when i looked at the implementation i saw that you need a colored wallet to track the tx. I was wondering if it is possible to instead add an additional field to every transaction that stipulates the color. One wallet can then maybe track your balances in different colors.

If there are holes in my logic,i'd be grateful if someone points it out.