Perhaps in the eyes of ordinary people, monochrome sample printing is much simpler than color sample printing, and the requirements for ink will be relatively low. In practice, the printing staff pointed out that the requirement of printing ink for single-color sample printing is not low, and the modulation of ink has a great influence on the quality of single-color sample printing.

October 12 is the anniversary of the discovery of the New World by Columbus in 1492. On the same day, protests broke out in the capital of Guatemala, protesting people's attempts to overthrow the statue of Columbus, and also "beheaded" a 19th-century presidential monument and splashed red paint to protest the colonial aggression of the local aborigines by European colonists.