Brass Grommets turning fabric green

[JayhawkJumper 0]

Anyone ever heard of this or seen it? I opened my reserve today to pack it and there were traces of green discoloration around the grommets on the slider and anywhere on the lines or canopy that th grommets touched while in the pack. I emailed PD some pictures and they thought it was the marker they use in construction. However, just a second ago, I wiped the grommets with a dry white cloth and it turned bright green. I sent another email back to PD to see if they know what might be causing it, but has anyone here seen this or know what causes it? A friend of mine who is also a rigger said it is the brass tarnishing which shouldn't harm the canopy and it doesn't seem to have affected the strength of the fabric.

[MrBrant 0]

Maybe they're copper grommets

[ryoder 1,590]

Copper oxide. Brass is 2/3 copper, and 1/3 zinc.

"There are only three things of value: younger women, faster airplanes, and bigger crocodiles" - Arthur Jones.

[riggerrob 643]

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Anyone ever heard of this or seen it?

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Dozens of times.

When copper and brass corrode, they form a green cupric oxide (sp?).
It is just a fine dust, with no rough edges to damage fabric.

Cupric oxide is as harmless as the grey/black iron oxide formed when stainless steel corrodes.

The only oxide that we worry about is the red iron oxide formed when carbon steel corrodes. Now that can produce some rough edges that chew on fabric.

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