Neither. The yolk of the egg is yellow.
This rather popular substance is water. At 32 degrees fahrenheit, the density of ice is .9175, whereas, the density of water at 32 degrees is .9988. When you add ice to water, you will notice it always floats.
Since none of the men are wearing the colour of the suite that corresponds to their names, and Mr. Red was replying the man in the blue suit, it had to be Mr. Green to whom he replied. We then know that Mr. Green is wearing a blue suit. Therefore, Mr. Red is wearing a green suit and Mr. Blue is wearing a red suit.