[@Masaki Haruna] [@ryoryoryoken] I'm not Ryo, but I mean, to spin these silk strings [i]in theory[/i] doesn't mean they have chakra in them. 

But since she gets a sensory field from them, they would have chakra in them (the 'detection' occurs from the feelings of her chakra being broken by movement, not the actual breaking of string, though one could say they are one and the same.) and thus the Sharingan can see them. 


That's purely based off of what we've seen in the anime though, and that's the way to go. That said, not sure that 'seeing' the strings will offer you an advantage, since Senhime can theoretically string up so much silk that you [i]have[/i] to break it.