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In the automotive trade corona stain is commonly known as the [light brown] or rusty stain found on a spark plug operating at normal temperature (or so says a promotional video from NGK) However we tend to beleive that the term "Corona stain" should be used in conjuction with a hard night [on the booze] (namely "corona") and a visit to the bogger [the morning after],hence creating a "rusty or brown corona stain" around the toilet or on ones undergarment that appear to have a hazey "ring around saturn" appearance
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