Novel form of the disazo pigment from bisdiazotized 3,3'-dichlorobenzidine and 1-(p-tolyl)-3-methylpyrazol-5-one

摘要: A highly covering disazo pigment having the chemical constitution ##SPC1## Which is characterized by a specific surface of 12 - 30, preferably 15 to 25, m2 /g, maximum grain size distribution between 250 and 500 nm proportion these sizes in total 35 65 percent, 45 60 percent. This new form obtained heating after coupling with solvent which immiscible water or miscible limited degree only temperatures above 100°C.