Invisible Spectral Hand?

[RJ Dalton 89]

So, even playing this game for two decades now (Pathfinder and D&D), I'm amazed how sometimes you can run into a situation that's never come up before, but here it is.
If you are invisible and you cast spectral hand, but haven't cast any touch spells through it yet, is the spectral hand invisible along with you until you use it to attack, or is it visible because it's separate from you?
I can't find anything on this anywhere. My original thought was to say no, but it says the spectral hand is an extension of you since it's made from your own life-force, so it seems like it might be invisible, too.
I think I might rule that the hand is invisible until an attack is made by you (with it or not), but is there an official ruling anywhere?

[Diego Rossi]

I doubt that there is any official ruling, but the spectral hand isn't a part of you, nor a part of your carried equipment.

Invisibility says: "Items dropped or put down by an invisible creature become visible; items picked up disappear if tucked into the clothing or pouches worn by the creature." Casting spectral hand you "create" a spectral hand that hovers near you. So it isn't in your possession, nor it isn't under your garment. There is no reason for it to be invisible.