What Changes Colour Once It Is Halved?

Riddle: I start off red, then I am halved, and turn blue. I am then halved once again, and turn pink. What am I ?

Answer: Australian notes (money) $20 note is red $10 note is blue And a $5 note is pink!

Source: https://www.riddles.com/7799

I start off red, then I am halved, and turn blue. I am then halved once again, and turn pink. What am I ? — What changes colour once it is halved? by Arwyn Morgan v1.

Riddle: I start off red, then I am halved, and turn blue. I am then halved once again, and turn pink. What am I ? Answer: Australian notes (money) $20 note is red $10 note is blue And a $5 note is pink! — by Arwyn Morgan v2.