In a real card color business card printing and membership card use Ribbon called YMCK ribbons, the letter k business card printing and membership card-making industry is used to describe black.

• 在本质卡片不暗白制卡和会员卡制息洋搁置的色带叫做YMCK色带，字母K在制卡和会员卡制息产业洋用来刻画暗色。