Tetra sodyum;3-[[4-[[4-[(6-amino-1-hidroksi-3-sülfonato-2-naftilazo)]-6-sülfonato-1-naftil]azo]-1-naftil]azo] naftalin-1,5 disülfonat (dırect blue 71)' ın elektrokimyasal indirgenme davranışının belirlenmesi Investigation of electrochemical behaviours of tetrasodium; 3-[[4-[ [4-[(6-amino-1-hydroxy-3-sulphonato-2-naphthylazo)]-6-sulphonato-1-naphthyl]azo]-1-naphthyl]azo] naphthalene-1,5-disulphonate (direct blue 71)