blue coolant is stupid IMO.
"Usually" fluids/oil are colored with different dyes to make it easier to identify... if there is a leak.
Spaceship, if there is still a leak, try getting some on your finger and smell it.
If it smells sweet or like maple syrup, then it's fresh coolant.
If it smells fishy, then it's old coolant.
If it smells like soap or windex/ammonia, then it's windshield washer fluid.