discover (someone's) true colors

Translations
узнать истинное лицо (кого-то)
After working with him for a few months, I discovered his true colors.
После нескольких месяцев работы с ним я узнал его истинное лицо.
Definitions
To reveal or uncover someone's true character, intentions, or feelings, especially when they have previously been hidden or disguised.
Words
discover

verb
раскрыть
someone

pronoun
чей-то
is

functional word
есть
true

adjective
истинные
colors

noun
цвета