Contrary to popular belief, there is nothing harmful in the film on the surface of tea.
There is no reason to be afraid of drinking such tea, experts say.
We'll tell you why a film appears on tea.
Why does tea become covered in a film?
The main reason for the formation of a film on tea is the use of hard water with a high content of calcium carbonate for brewing it.
Carbonate film appears on any tea prepared with water containing a high concentration of calcium carbonate and is completely harmless.
A carbonate film also appears on water poured into a cup, but it is more noticeable on tea due to its color and composition.
The polyphenols contained in tea react with calcium carbonate, accelerating the formation of the film and making it denser.
The color of the carbonate film depends on both the quality of the water and the type of tea.
So, a whitish coating on tea appears due to the presence of lime impurities in the water.
The reason for rainbow stains is the high content of essential oils or liquid flavors in tea.
In the latter case, the carbonate film becomes more pronounced after the tea has cooled.
