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Re: Aquatic Plants Digest V2 #577
> >From: mark.fisher at tpwd_state.tx.us
> >Date: Wed, 12 Mar 97 11:13:45 cst
> >Subject: Water color
> > >If you don't believe me, do
> > >the test that I suggested. . .
> > >Remember, pure
> > >water will have a light blue hue when you put it in a white
> > >container.
> > I do ALL my water changes in a five gallon white poly bucket, and I
> > can assure you my water is not yellow. The tank water is not yellow
> > and the bucket water is not yellow; it is colorless.
If it appears colorless, then it has a small amount of yellowing
> > I must also disagree with your observation that you can see a light
> > blue hue in your bucket. It is true DEEP bodies of water appear blue
> > because the other colors are more readily absorbed, but you would only
> > see this phenomenon in water that is several FEET deep, not inches.
> > Red light is absorbed first and can penetrate as deep as 20 feet.
> > Blue light is absorbed last, and can penetrate over 1,000 feet.
> > This information is available in any basic oceanography or limnology
> > text.
You don't know what you are talking about. Pure water in a white 5 gallon
bucket has a discerably blue hue to it. Period, end of story.
If you have not seen that blue hue, then one of three things is true:
1. You don't have pure water.
2. You are colorblind.
3. Your light source is almost entirely devoid of blue content.
As far as my needing to read a basic oceanography or limnology text, I
already have, then I read the advanced ones.
> Be that as it may, there IS a light blue hue in my 5-gallon poly bucket when
> I draw it full of tap water and view it in the presence of sunlight. I just
> looked at the same bucket of water, which has been treated for chloramine
> and aerated for over 24 hours; it had no blue hue, but was viewed under
> incandescent light. I have moderately hard tap (<>140ppm) with whatever
> standard component of fluoride might be in there, as is typical for Clifton,
Now here we have someone with a pair of functional eyes attached to a
functional brain. In some areas of the country, the tap water is
sufficiently free of humic acids that when you draw a bucket of it, or
fill a white tub with it, you can see the very light blue hue of pure
water. The last time I saw that with tap water, it was in a hotel in DC.
> Now, is the hue gone because of mineral loss? Fluoride?
> Chlorine/chloramine? The different lighting?
It is possible that the lighting has something to do with it. More than
likely, though, there is enough low-quality organic material in the
dechloraminator to put a fraction of an APHA color unit in the water in
the bucket, which is all it takes to kill the blue color.