“Does the color of the pen I use matter?”
What the person asking means is the ink color, not the color of the pen. Is it completely wrong to say “pen color” instead of “ink color” (the question was asked during an English exam)?
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"Pen color" or using "red pen" or "blue pen" should not be wrong when clearly indicating the color of the ink.
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Pen color. All geometric shapes (such as points, lines, and circles) are drawn using the current pen color. By default, it is black.