I know that the universal indicator is a solution of various pH indicators used to find out the pH of a substance by displaying different colors.
But, what is the pH of the universal indicator itself?
I found this line on the Wikipedia page for pH indicator:
In and of themselves, pH indicators are frequently weak acids or weak bases.
A quick google search indicates that a universal indicator is usually composed of thymol blue, methyl red, bromothymol blue and phenolphthalein.
How can this information be used to infer the actual pH of the universal indicator itself?