Among other things, Ger saw fit to write:

> You're getting there.
> The color of water is determined by what's underneath it because water by
> itself is colorless. Have a look at a swimmingpool :)

Our swimming-pool is not painted, the walls and floor are just bare concrete
(a bit greenish with time). When it has been just filled with clear water
(from the well) it has a beautiful bluish-greenish tint which becomes bluer
(can I use this word?) after adding some chemicals (especially copper
sulfate). After a couple of months of use, and if we have been unlucky with
the weather (too many storms), the water is completelly dark green, and I
mean *green* you cannot see the floor and sometimes your own feet. With
some effort it comes back to transparency, but still with a blue tint.

Yes, I know about the chemicals, the particles and the algae, it's just that
looking at a swimming-pool is not the best way to know what colour water
has. Nevertheless, I always see a blue tint, in the just-filled
swimming-pool and in the bathtub (but it's chlorinated water), just look at
your own skin underwater, it doesn't have the same colour as outside.

-- 
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