Well I don't know about you guys but back here in holland the sword really looked purple or blue(i'm talking about the episodes). I'm pretty sure of it. And this sword doesn't even look like a sword it loks more like an ogre club.
Well, the sword is silver, but it's an effect to make it shiny, they use Purple. So its the shading that Purple, as for the actual sword, it's silver.
At least, I think thats why its purple. Trust us cold steel, it's grey.
is it just me or did trunks break his sword more than once in movie 7 in android saga and in the speacial history of trunks how the hell did he have the sword he got it in the flash back in movie 13 that is just my thouts
People get confused about this a lot but this is the way I see it:
Mirai Trunks (Future Trunks) has a sword but there isn't any explanation as to how he got it, he just gains it sometime between Gohan's death and his fight with the Androids as a Super Saiya-Jin. Theres actually a pretty cool Fan-Fic which explains how the sword came into being, I have the link somewhere..
Chibi Trunks (Little Trunks) gets his sword from Tapion in Movie 13 but this isn't supposed to be a way of explaining how Mirai Trunks got his sword. IMO this is supposed to show how connected both timelines are i.e. both Trunks get swords. Which is why it shows the flashbacks to Trunks' fight with Frieza using his sword.