Tips for dyeing/dyeing|Difficult to stain color in active dyeing -Purple analysis [Dye analysis]

The formula is generally spelled with brilliant blue R and brilliant red 3BF.

The color flower is relatively small, but because Yan Lan R and Red 3BF have different requirements for time, temperature, and saline, the stability of the colored light is more difficult to control. The possibility of cylinder difference is the greatest.

The difficulty of this formula is that after adding alkali, brilliant blue R can not be directly dyed, but generate a structure with low solubility but can be dyed, but the red 3BF after the increase in the speed of the dyeing speed up many, when two dyes are dyed The difference in performance is more important. It is the key time for various kinds of dyeing, and red will gradually lag behind in the later stage of dyeing. That is, 40 minutes of fixing time is much more than 30 minutes of red light. This also causes the color light to be unstable. One of the factors.

After several trials, I felt that this kind of process used a constant-temperature method and it worked well. That is, after the temperature was raised to 55 degrees, the dye was added, and then dyeing at this temperature, alkali fixation was fixed. This ensures that there is a sufficient fixing time. This is also very important. Because the performance of Brilliant Blue R determines that the amount of salt and alkali should not exceed 50g/L and 20g/L. The constant temperature method can make the difference of the dyeing properties of the two dyes to the minimum, so as to achieve the stability of colored light.