Nowadays, basic malachite green dye is widely used in industrial printing and dyeing. We all know that basic malachite green is used for coloring, but in the process of coloring, it will also present the phenomenon of unqualified color fastness, which is related to the problem of dyeing fastness of basic malachite green, also known as dyeing fastness. So how can we test whether the dyeing fastness of basic malachite green is up to the standard?

1. Fastness to sunlight
The fading of dyed fabric in the sun is a complex process. Under the effect of the sun, the basic malachite green absorbs the light energy, and the molecules are in the excited state and become extremely unstable. It is easy to have some chemical reactions, which will cause the dye differentiation and fading, and lead to a large fading phenomenon of dyed fabric after the sun. The light fastness changes with the dyeing concentration. The light fastness of low concentration is worse than that of high concentration. The light fastness of the same dye on different fibers is also quite different. For example, the light fastness of indigo on cellulose fiber is only grade 3, but on wool is grade 7-8. The light fastness is also related to the aggregation of basic light yellow on fiber, dyeing process and other factors.

2. Conflict fastness
The conflict of dyed fabric can be divided into dry conflict and wet conflict fastness. The former is used for white conflict fabric to see the staining status of white cloth, while the latter is used for white conflict fabric to see the staining status of white cloth. Wet conflict is caused by external force conflict and water effect, and its wet conflict fastness is generally lower than that of dry conflict. The conflict fastness of fabric mainly depends on the number of floating colors, the combination of basic light yellow and fiber and the uniformity of dye penetration. If the dye and fiber are covalently bonded, its conflict fastness is higher.

3. Soaping fastness
It refers to the fading degree of dyed fabric after soaping in soap solution under specified conditions, including the original fading and white cloth staining. The original color fading is the color fading state of dyed fabric before and after soaping. White cloth staining refers to the condition that the white cloth and the dyed fabric are sewn together, and the color of the dyed fabric is stained due to the fading of the dyed fabric after soaping. The soaping fastness is related to the chemical structure of the alkaline light yellow and the combination of the dye and the fiber.

The above is the method that we introduced about whether the dyeing fastness of basic malachite green dye is up to the standard. Have you learned it?

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