Congo blue

例句：

1. 1. The Congo blue dye was used to create the vibrant colors of the fabric.
   刚果蓝染料被用来给织物上色。
2. 2. The artist used Congo blue to paint a picture of the jungle.
   艺术家用刚果蓝来画一幅丛林的画。
3. 3. The Congo blue dye is a natural pigment that has been used for centuries in traditional African art.
   刚果蓝染料是一种天然颜料，在传统的非洲艺术中已经被使用了好几个世纪。