stir the slurry for at least 4 hours then filter the slurry use the wetcake in stage 2 in a large beaker add water and hydrochloric acid add the wetcake of naphthionic acid from stage 1 agitate slurry for at least 2 hours in a separate beaker prepare a solution of sodium nitrate in water and add it slowly to the naphthionic acid slurry stir for 15 minutes checking acidity with congo paper and adding hydrochloric acid as needed check nitrite value using ki starch paper adding sodium nitrite as needed when both acidity and nitrite values are adjusted stir for 3 hours regularly checking both values stage 3 coupling of polyethoxylated aniline ethox ana 50 with naphthionic acid diazonium salt in a large beaker add preheated liquid ethox ana 50 liquid slowly transfer the naphthionic acid diazonium salt from stage 2 to the beaker containing the liquid ana 50 and agitate the mixture for about 30 minutes neutralize the reaction mass with triethanolamine to ph 7 5 7 8 agitate the reaction mass for at least 5 hours the process of formulating rinsable violet dye according to the present invention comprises five stages 1 condensation 2 first oxidation 3 second oxidation 4 neutralization and dilution and 5 filtration in a large flask add polyethoxylated aniline s10 800 g formaldehyde 61 g as 37 and sulfuric acid 13 g as 96 heat the reaction mass to 125 u00b0 c and maintain that temperature with agitation for 20 hours cool the material from stage 1 down to 85 u00b0 90 u00b0 c then add polyethoxylated aniline s10 400 g and sodium iodate 50 g as 98 heat the mixture to 125 u00b0.