Natural wood and baking soda

Question
I have a 29 gallon freshwater tank, and I added some driftwood 4-5 months ago. I did the whole soaking and scrubbing bit, and for the first 2-3 months my tank was beautiful. For the last two months, however, my water has been turning that orange/brown/amber color and the only explanation I can come up with is that it's from the wood.

It was not algae, but just in case I had put in some algae killer (as recommended of course). That didn't help, so figure it's the wood. The question is, why now? The first 2-3 months it was fine. So I thought that perhaps it may be the baking soda I add sometimes. I add baking soda during water changes since the ph in the water from my tap is lower than my tanks ph.

It may be just my imagination, but I think the water gets much darker when I add baking soda to a water change then when I don't. Is it possible that the baking soda is the problem? Does it somehow react with the tannin in the wood? Or is there something else I should try?

Thanks so much for your help, and sorry for the long winded message!

Answer
it's just an issue with the driftwood. I have been told boiling the wood first and letting it dry takes away the wood coloring the water. I've never used baking soda to do anything with any of my tanks but the backing soda is probably reacting with something in the wood which causes the notice color difference from when you add the baking soda or not. Happy Fishkeeping.