What does blue pulp mean?

The blue paddle is an oar made of blue wood.

From Su Shi's "Thousand Chibi Fu", the original text: "Return to Xi Lan Paddle, strike the sky and trace the streamer; I am pregnant, and I hope that beauty is on one side. " Sweet-scented osmanthus wooden boat paddles Aoki, facing the empty waves and the floodlight of running water. My heart is far away, and I want Iraqis on the other side of the world. "

Su Shi's ci is profound and his ci is harmonious. His name is Dongpo Jushi, and he is called Su Dongpo and Su Xian. Han nationality, Meishan, Meizhou, Northern Song Dynasty, Luancheng, Hebei. He was a famous writer, calligrapher and painter in the Northern Song Dynasty. He is the representative of the highest literary achievement in Song Dynasty, and he has made great achievements in poetry, ci, writing, calligraphy and painting. His poems have a wide range of themes, fresh and vigorous, good at exaggeration and metaphor, and unique style. He and Huang Tingjian are also called "Su Huang".