Jasno crvena 28
reakčná zmes komplexov železa s týmito zlúčeninami: 4,4’-dihydroxy-N-fenyl-3,3’-[(a, b-dihydroxy-1,n-fenylén)bis(diazéndiyl)]di(benzénsulfónamid), kde n = 2, a = 3, b = 4 alebo n = 3, a = 2, b = 4 alebo n = 3, a = 4, b = 5;