Reaction mass of disodium 7-[(4-chloro-6-{ethyl[4-(vinylsulfonyl)phenyl]amino}-1,3,5-triazin-2-yl)amino]-4-hydroxy-3-[(4-methoxy-2-sulfonatophenyl)diazenyl]naphthalene-2-sulfonate and trisodium 7-({4-