There are many factors that influence the performance of specific reactive dyes, some general factors are listed below:- • Molecular structure of dye, will dictate the applications conditions required • Material being dyed, including the preparation before dyeing • Application conditions, e.g. temperature, pH, time, liquor ratio etc Quality of the dye • Quality of the dyeing auxiliaries • Quality of the water being used to dye the material, soft water is preferred • Condition of the dyeing machine, machines in good condition will be more reliable that machines with broken or missing parts What are some important points to consider during the determination of a dye recipe for exhaustion dyeing with reactive dyes? The optimum dyeing temperatures and dyeing conditions for reactive dyes differ according to the type of reactive group involved, so the first thing that must be decided is the type of dye that will be used. The substantivity to cellulose of reactive dyes is lower than that of d