红染料、紫染料是用同一品种而叶状不同的红蓝草经水煮而成。叶片稍长，颜色

Red dye and purple dye are made from red and blue grass of the same variety but with different leaf shapes. The leaves are slightly longer and darker in color, and the boiled color is thicker, the rice soaked becomes purple; the leaf is rounder, the color is lighter, the boiled color is lighter, the rice soaked is bright red.

Red dye, purple dye is the same variety and leaf-shaped different red and blue grass boiled by water. The leaves are slightly longer, the color is slightly darker, the boiled out of the color is thicker, the bubbled rice is purple;

Red dye and purple dye are produced by boiling the same variety of red and blue grass with different leaf shapes. The leaves are slightly longer and darker, and the boiled color is thicker. The rice is purple when it is soaked; the leaves are round and lighter, and the boiled color is lighter, and the rice is bright red when it is soaked.