Toyota Repair: engine coolant, engine coolant, air bubble

Question
I have a 2002 v6xle camry. I went to the dealership to have my coolant changed. After a day or two I checked it and it was far below the "low mark" I took it back and they checked it and said there weren't any leaks, that it was probably an air bubble. They filled it up and I went on my way. When I got home I checked it and the resevoir was filled to the correct level but they filled it with a green fluid. I have always known Toyota for a pinkish red coolant. Even when my fluid level was far below the low mark I could see the pink fluid. What is this green fluid? And is it Ok to mix the two?

Answer
Toyota installs the red coolant at the factory, not sure why, but it is routinely changed over to the green coolant at the first coolant change, they probably forgot to change the coolant in the bottle, don't worry they are made from the same basic chemicals and will mix with no problem.