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Hi Alain. Regardless of the color you still want to use coolant that is ethylene glycol based. If you are going to a parts store, or marina, you specifically want to ask for "ethylene glycol" based coolant. When you look at bottles of coolant, it needs to say ethylene glycol someplace on the bottle.
Coolant comes 2 ways, it comes pre-mixed and full strength. If you buy it pre-mixed you can just dump the bottle into the engine. If it comes full strength, you would need to mix that 50/50 with distilled water. Does that make sense to you?