toluidine blue

例句：

1. 1.The toluidine blue stains the paper a bright shade of blue.
   甲苯蓝使纸张染成鲜明的蓝色。
2. 2. The toluidine blue dye was used in the process of printing.
   甲苯蓝染料用于印刷过程。
3. 3.The toluidine blue solution is used to stain fabrics.
   甲苯蓝溶液用于给织物上色。