OK here are a couple of pictures of a 9 months old 20,000km trans fluid looks like. I pour it back from the old container and use a clear bottle to show you the difference.
If you haven't figured it out the bottle on the left is new trans fluid and the one on the right is the old trans fluid.
Notice the old fluid still has a very slight red tint but its like a black coffee colour. I know colour shouldn't really makes a difference but it does make you wonder hey?
The images comes with 
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