Translation guide
How to express the idea of someone showing their real character, usually in a negative sense, after having hidden it.
To say that someone has finally shown their real, usually bad, character or intentions.
Literally 'to reveal one's true nature'. This is the most direct and common equivalent. Often used when someone's hidden bad side comes out.
He finally revealed his true colors.
To say that someone has shown their real, good character or abilities, often after being underestimated.
Literally 'to demonstrate one's true ability/character'. Used when someone finally shows their real worth or talent, often in a challenging situation. Has a positive connotation.
The English idiom 'reveal one's true colors' does not have a direct word-for-word equivalent in Japanese. Avoid translating 'colors' literally as 色 (いろ). Use the phrases above instead.
本性を現す and 化けの皮が剥がれる are almost always negative. 本領を発揮する and 真価を発揮する are positive. Choose based on whether the revealed nature is bad or good.
When it comes to money, people show their true colors.
Literally 'the monster's skin comes off'. A vivid idiom meaning someone's disguise or pretense is stripped away, revealing their true (usually bad) self. Often used when a deception is exposed.
His kind attitude was a lie. His true colors finally showed.
Literally 'to reveal one's true identity/form'. Similar to 本性を現す, but can also be used for non-human things like revealing the true nature of a problem or phenomenon.
That incident revealed the true colors of society's dark side.
Literally 'the base metal shows through'. An idiomatic expression meaning one's true (often unrefined or bad) character is revealed, especially after a polished exterior cracks.
When he gets angry, his true colors come out.
He showed his true colors in a pinch.
Literally 'to demonstrate one's true value'. Similar to 本領を発揮する, emphasizing the revelation of genuine worth or merit.
She revealed her true colors in this project.