The Stillwater Tragedy by Thomas Bailey Aldrich

Mr. Taggett, in spite of the excellent subjection under which he held his nerves, caught his breath at these words, and a transient pallor overspread his face as he followed the pointing of Richard's finger. If William Durgin had testified falsely on that point, if he had swerved a hair's-breadth from the truth in that matter, then there was but one conclusion to be drawn from his perjury. A flash of lightning is not swifter than was Mr. Taggett's thought in grasping the situation. In an instant he saw all his carefully articulated case fall to pieces in his hands. Richard crossed the narrow room, and stood in front of him.

"Mr. Taggett, do you know why William Durgin lied? He lied because it was life or death with him! In a moment of confusion he had committed one of those simple, fatal blunders which men in his circumstances always commit. He had obliterated the spots on his clothes with red paint, when he ought to have used blue!"