Harry Potter is on of those series' that we can watch - or read - again and again.

And it feels like every single time we do, we find out some detail that we never would have spotted before. However, there is definitely no way we would have caught this one about Lord Voldemort. Yes, it turns out in the final two movies He Who Must Not Be Named's robes get lighter and lighter as Harry, Ron and Hermione hunt down the the Horcruxes. [caption id="attachment_486283" align="alignnone" width="1202"] Here is Voldemort before his final battle with Harry[/caption] [caption id="attachment_486282" align="alignnone" width="1440"] Annnnd here is Voldemort after Naigini is killed[/caption] To be honest, we had just assumed it was dust. After all, the entire Hogwarts castle was collapsing/in rubble, so it seemed like a pretty safe guess. However, it turns out it wasn't dust - it was a purposeful decision. The official Wizarding World Instagram account revealed earlier this month that the decision was made to make it seem like he was "slowly fading away". "Did you know? In the Harry Potter films, Voldemort's robes faded in colour every time a Horcrux was destroyed, to give the impression he was slowly fading away," they wrote. And judging from the Harry Potter fans' reactions to the post, it seems like we weren't the only ones who never noticed this detail. "Now we need to watch these all over again to spot this," one person said, while another added, "So cool! I don’t think I ever noticed that."