Well... I had several of my N-frames from the late 70's and early 80's where the barrels went plum on me after I put them in silicone impregnated bore stores for storage in my gun safe. And on portions of the frames, a milky looking haze developed that will not come off with any conventional gun cleaner I've tried.

The guns were continuously in the bores stores for about 6-8 months until I went though everything in my safe to do my usual pre-winter inspection and "winterizing" regimen.

Needless to say, I've long since discontinued using the bores stores.

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Conrad
SWCA #1830 SWHF #222