Discharge printing for a long time has been applied in printing field to create plentiful patterns on a dark ground with high quality, brilliant colours and cost effective.
So far, discharge printing is popular performed on the ground dyed with dischargeable reactive dyestuffs ie. the dyestuff can be discharged by discharging chemicals- normally are powerful reductive agents. Discharge printing on Indigo dyed ground such as denim is more difficult because of these obstacles: