Sentence:  Six wings he wore, to shade / His lineaments divine; the pair that clad / Each shoulder broad, came mantling o'er his breast / With regal ornament; the middle pair / Girt like a starry zone his waist, and round / Skirted his loins and thighs with downy gold / And colours dipt in Heaven; the third his feet / Shadowed from either heel with feathered mail, / Sky-<WSD>tinctured</WSD> grain. 
Meaning of the word marked with <WSD> tags:  To tinge; to taint.