The refrigerant itself does.
The dye travels with the refrigerant and oil through the system.
The refrigerant itself does.
The circulatory system.
It transports nutrients through your body.
The vascular system, specifically the blood.
Yes, it's the circulatory system.
The dye is carried along with the lubricating oil as it moves through system.
muscular
It transports materials
Well I've seen ultraviolet reactive refrigerant that will indicate leaks, when a UV light is shinned on it.
Through the schrader valve on the low pressure side of the system.