A Copper Pen and the Speed of Sound (Drawing in my Sketchbook)

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Using a very cool copper fountain pen today to draw in my sketchbook (I used Platinum Carbon Black ink). I got confused and called it brass a few times, but I think brass has an appearance more similar to gold, and there is a brass version of this pen available as well, even though it has paint that you're supposed to sand off at your own discretion.
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