How does black tea change color when it comes into contact with acidic, neutral and alkaline milia?

Moin,

black tea becomes darker in lye (alkaline milieu) and brighter in acids (acid milieu) and in water (neutral milieu) it becomes even (something) brighter, but still darker than in acidic milieu.

But precisely because black tea lights up even when adding to water, it is sometimes difficult to decide whether it became brighter because it was diluted or whether it became brighter because it was given to an acidic medium. This is especially difficult to determine if you have no comparison or the acid is only weakly concentrated.

Conclusion:
Lucks (an alkaline environment) can be found well with the help of black tea because it gets darker there. But whether a liquid is an acidic or neutral medium is not so easy to recognize, especially if one has only one liquid before it or the acid is weakly concentrated.

This is because black tea is a so-called “single-color” pH color indicator. You can distinguish the different milieus only with the lighter or darker brown color.
Therefore, black tea is basically a pH color indicator, but not a particularly good…

LG from the Waterkant