Write a word on the paper with a red pen. What do you see when you are illuminated by red and green light in a dark room?

Red pigment is observed by emitting red light of the same color, and white is reflected by all colors.

So the paper with red light, scarlet letter and white background saw a piece of red.

The scarlet letter will absorb the green light under the green light, and the words will not reflect the light, while the black and white paper will reflect the green light.

So it is black and green paper.

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