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To
begin with, generally the water supplied through pipes for household
use is not blue in color. When copper ions get dissolved in the water
supplied through pipes, the water turns blue in color only when the
concentration is more than 100ppm. Concentration of copper ions in water
supplied to homes for domestic use is only 1 ppm. Thus this water cannot
turn blue because of copper ions. Consequently
the color of the water may seem cobalt blue because
of the reflection/absorption of light on/by the transparent water of
the rivers or lakes. Thus the color of the water can be verified by
pouring it into a transparent glass. Sometimes one notices blue colored
water in the bathtub. This may be because the soap particles or dirt
in the bathtub react with the minute quantity of copper ions present
in the water. Though this is not harmful, one can clean the bathtub
with the cleansers used to remove oil and grime in the kitchen in order
to prevent this.
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