Colorless and transparent: saliva, lymph, pure gastric juice, pancreatic juice, etc.
The red one is: blood
Pale yellow: plasma.
Finally:
Needless to say, the color of sweat is yellow or other colors, it is necessary to see a doctor;
Urine is colorless, light yellow, yellow and normal. If it's red, it's time to see a doctor.
Milk is milky white, vaginal discharge is colorless and transparent, milky white is yellowish, and it may be reddish before and after menstruation. If there are other colors, please see a doctor in time.