Soaking Driftwood - Green Tannins? - The Planted Tank Forum
 
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post #1 of 11 (permalink) Old 02-24-2012, 01:58 PM Thread Starter
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Soaking Driftwood - Green Tannins?

So I got this nice piece of malaysian driftwood from a reputable LFS and started soaking it in a bucket in an attempt to get as much of the tannins out as possible before putting it in a tank.

For the first week or so, the bucket water would be yellow and eventually turn brown if I didn't change the water for a while - totally normal.

Then to speed up the process, I boiled the driftwood for 15 mins and then the following day for about 2 hrs.

Now w/ the driftwood left in the bucket to soak, the water takes on a greenish hue, not yellow. Any ideas why this is and should I be concerned?

Thanks in advance!
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post #2 of 11 (permalink) Old 02-24-2012, 02:18 PM
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You are growing algae from not changing your water in the bucket? Algae only takes a few days to be visible, especially if its sunlit.

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post #3 of 11 (permalink) Old 02-24-2012, 03:48 PM Thread Starter
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I change the water every day or so and the bucket is only exposed to ambient lighting, but algae is still a possibility. The fact that it only started after I had boiled the driftwood tho just makes it seem like there's some unknown correlation.
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post #4 of 11 (permalink) Old 02-24-2012, 04:29 PM
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Maybe its just not leaching that much and its causing a different tinge? as long as it doesn't smell funny, should be OK

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post #5 of 11 (permalink) Old 02-24-2012, 07:43 PM Thread Starter
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Hmm... interesting idea. Ya I was thinking that maybe boiling drew out tannins from deeper inside the wood that is perhaps a different color. Googling "green tannins" brings up search results pertaining mostly to tannins in wine.

Neither the water nor the wood smell, which is a good thing.
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post #6 of 11 (permalink) Old 02-24-2012, 11:42 PM
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That's interesting, I never heard of wood leaching green tannins.
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post #7 of 11 (permalink) Old 02-25-2012, 01:38 AM
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It depends on the type of wood. Some will exude different colors. Some are used as a natural dye.


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post #8 of 11 (permalink) Old 02-25-2012, 01:51 AM Thread Starter
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O nice, I didn't know about them being used as dyes. Learn something every day I wonder if the boiling altered the tannins in the wood somehow.

Well to [I think] rule out the possibility of it being algae, I emptied out the water today and am keeping the bucket covered so that no ambient light gets in. We'll see after a day or two if the tannins are still green or if they've gone back to being yellow.
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post #9 of 11 (permalink) Old 02-25-2012, 04:56 AM
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It depends on the wood, not saying malaysian driftwood counts as one but who knows what type of it is. Ambient light isn't enough to trigger green diatom algae for sure.


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post #10 of 11 (permalink) Old 02-26-2012, 06:57 AM
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Is your bucket blue?
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post #11 of 11 (permalink) Old 03-07-2012, 02:26 PM Thread Starter
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Just a quick update to put this to rest in case anyone runs into something similar. Last week I filled my [white] bucket w/ new water, covered it w/ a dish towel to prevent light getting in, and went to Miami for a few days

When I got home, I checked the bucket and the tannins were brown again. Looks like ambient lighting was enough to grow algae in the bucket before! Weird.
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