In general, use warm, arousing ink hues (like red, orange, and yellow) to get attention and encourage alertness. Use cold, passive ink hues (like green and blue) to encourage calm and creativity.
A pen is a writing instrument used to apply ink to a surface, usually paper, for writing or drawing. Historically, reed pens, quill pens, and dip pens were used, with a nib dipped in ink.





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