Commercial Serum and plasma tubes

The commercially available serum tubes are as follows:
Red	No anticoagulant.
Red with black	Gel to help to separate the clot (not evaluated).
The commercially available plasma tubes are as follows:
Lavender	EDTA.
Blue	Citrate.
Green	Heparin.
Grey	Potassium oxalate/sodium fluoride (not evaluated).
Yellow	Oxalate/sodium fluoride (not evaluated).