User blog comment:Martialmaniac/How does "In" work?/@comment-4313204-20150627033701

Well I guess since In is literally an advanced technique of Zetsu, it may also be a kind of technique of preventing the user's aura from leaking out of his/her body.

But as we know In, unlike Zetsu, won't prevent the user's aura from flowing, and it can be cast on Nen items (like Kurapika's chain and Machi's thread). I guess when someone uses In, the user preventing his/her aura from leaking out while not shutting the aura nodes, making the aura flowing inside his/her body.

It makes sense as En is able to detect In, presumably by detecting the aura flowing inside the owner's body.

But still I'm not able to explain how to apply In (and En, in Kortopi's case) to Nen objects.

Just some random thoughts...