Which preposition to use with informative

about Occurrences 1%

A bit of a pop-eyed bleater, but on the whole clean and civil, and certainly most informative about newts.

for Occurrences 1%

The Whipples, strangely, were all not a little embarrassed in his presence, and the mere mention of his son caused him to be informative for ten minutes before any of them dared to confine the flow of his discourse within narrower banks.

of Occurrences 1%

" The girl looked at Racey Dawson as though the name of Tom Jones should have been informative of much.

Which preposition to use with  informative