Amines, rosin, compds. with 9-(2-carboxyphenyl)-3,6-bis(diethylamino)xanthylium chloride, 4-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-1-yl)azo]-3-hydroxy-1-naphthalenesulfonic acid chromium sodium complexes and formic acid