Subject: What liquid uses oxygen to turn blue? What is the name of this process?

We have a project where we have no backround info and have to find out why 
a certain liquid(maybe mixture)turns blue when shaken and what this 
substance is. I have figured out that this liquid uses oxygen to turn 
blue. I have also found the liquid turns back to clear 10-15 seconds after 
shaking. It makes a high piched sound when it is not shaken and then 
tapped. After being shaken it makes a low sound. It also seems to have 
small bubbles rising on the sides after being shaken and they mostly are 
gone when it turns clear. Please help me in finding eather the name of 
this chemical happening or what this liquid. 

Re: What liquid uses oxygen to turn blue? What is the name of this process?