What does this phrase mean? "a smoky goldshot stain"?

its an excerpt from Don Dellilos novel Underground. The full paragraph is:"He crouched under the great split sky, ears set low and his head sloped. Th

it's an excerpt from Don Dellilo's novel Underground. The full paragraph is:
"He crouched under the great split sky, ears set low and his head sloped. The sky was divided, split diagonally, a flat blue, a soft slatey blue, like the head of a crested jay, and a yellow that wasn't even yellow, an enormous heartbreak yellow sweeping to the east, a smoky goldshot stain, and the kids with the knotted arms fell down in a row."

or:it's an excerpt from Don Dellilo's novel Underground. The full paragraph is:\"He crouched under the great split sky, ears set low and his head sloped. The sky was divided, split diagonally, a flat blue, a soft slatey blue, like the head of a crested jay, and a yellow that wasn't even yellow, an enormous heartbreak yellow sweeping to the east, a smoky goldshot stain, and the kids with the knotted arms fell down in a row.\"

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