Gold Terminals on lead post?

The only time I've seen corrosion on battery terminals is when they were plated brass. The terminal (not the posts because lead is not very reactive either) corroded around a scratch in the plating. The zinc in the brass was what was corroding and the copper in the alloy was corroding slightly, too was evidenced by the blue-green color to some of the corrosion. Lead oxide is black. Zinc oxide is white. If the corrosion is white, then it's the terminals corroding.

 
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