Our water supply is fluoridated (Victoria, Australia). The bath has not been used for a long time as we prefer showers. The gas hot water was changed recently, but I don’t think that would have made a difference, and then I ran cold water in the shower and that too was dyed blue. Our water tastes really good. Believe me, we have a mixture of copper and PVC pipes.
Many of our white porcelain fixtures were stained blue due to copper leaching from the pipes due to acidic water. A pH treatment system was installed and the problem disappeared.
My friend had an old bathtub. The cap was metal, but badly corroded. Nobody else did this.
So they took him to a sheet metal workshop.
They paid to have it cleaned and galvanized.
It’s illegal to do that here in the US if you want chrome for some reason so they had to nickel.
They installed their shiny new stopper and filled the tub.
The water had a light blue tint due to the nickel reflecting blue light in the water.
If your water is really a certain color (put some in a clear glass and look at it), you have a problem.
You may need to call a plumber to investigate and fix what’s wrong.
Copper makes things blue. Don’t drink the bath water.
I go with the theory of refraction of light and also suggest soaking a glass in water and then holding it up to a different light to see if it actually retains a bluish tint.
it could just be an optical illusion based on your bathroom colors.
This is only an optical illusion NOT caused by copper pipes etc.
Dip a clear glass in the tub and hold it up to the sunlight and you will see that it is perfectly clear.
Water only filters certain frequencies of light and the deeper the water, the higher it is.
You can see that the shallow end looks almost clear.
I can tell, but the hard lighting you use is no less than 5000K LED bulbs.
And using high-temperature LED lights makes the situation worse, as they produce a lot more blue light spectrum.
Answer 6
It’s copper.
It tends to be worse if your water is acidic in nature.