White Residue on VCI Stored Guns

[Decker]

I don't really know what this is so I'm asking the community.

I have some pistols I stored a year or so ago that I had oiled, then wrapped in VCI paper, then sealed them in aluminum foil sealed storage bags.
Taking them out recently, I notice a white powdery residue on the outside of the VCI paper and also on the pistols themselves.
I see no evidence of corrosion on the pistols anywhere, but I'm wondering what going on that this white powder would form inside a sealed bag.
I "think" it's from the VCI paper, but I just don't know what's going on.

Anyone?

 

[chief38]

Hmmm, I've used lots of VCI paper over the years but have never encountered that scenario. The only thing that comes to mind is either white mold or a chemical separating out of the VCI paper. I'd put a call into the manufacturer of the VCI - or at least to the place you got it from. Maybe defective???

 

[altbrewer]

Is the aluminum foil on the inside or the outside of the bag? Maybe aluminum oxide?