Why is my Green Tea Brown but then Green when I reuse the bag? I've read the posts about why Green Tea can appear brown, and it makes perfect sense.  

However, what I'm experiencing is different.  When I reuse my Green Tea Bags a second time, I get the green color one would expect.  Totally counter intuitive, I know.

Any ideas why this is happening?

Some additional information: The green tea bags I buy are from a local Asian Market.  They are sourced from China, so not likely high quality.  I also do NOT place them in boiled water, but place 8 bags at a time in a gallon pitcher, in the room temperature purified water (reverse osmosis water), and let them steep for 24 hours.  I then refrigerate the tea.  First batch is always brown but the second batch made from the re-used bags is green.
I know that with pu'er tea (not a green tea), they rinse and 'awaken' the tea with the hot water first - dumping out the first brew (seemed like a waste to me).  They say the 2nd is good, but the 3rd cup and on is much better !  I never noticed the color of my green tea changing, but I must admit i like the second pot better than the first - when re-brewing same tea leaves.  perhaps the oxidation from the leaves is brewed of in the first pot?