一天,我在走廊上参观书法作品时,意外地发现用蓝墨水写的书法作品已褪色了,有些甚至已经褪得看不清了。而用黑墨水写的,书法纸虽然有些发黄,但是字迹仍清晰可见。这时,我又联想到填表、签合同……都要用黑墨水写。这是为什么呢?我心想:“难道黑墨水的稳定性比蓝墨水强吗?” One day, when I visited calligraphy works in the corridors, I unexpectedly found that the calligraphic works written in blue ink had faded, and some of them even could not see clearly. Written in black ink, calligraphy paper, although some yellow, but the writing is still clearly visible. At this time, I also think of filling the form, sign the contract ... must be written in black ink. Why is this? I thought: “Is black ink more stable than blue ink?”