Ink jet black ink, ink set, ink jet recording method, ink cartridge, recording unit, and ink jet recording apparatus

An ink jet black ink comprising at least a coloring material,

• wherein the coloring material is a compound represented by the following general formula (I) or a salt thereof;
• and
• wherein the ink jet black ink further comprises ethylene glycol or diethylene glycol, and
• wherein a content of ethylene glycol or diethylene glycol is 15 mass % or more and 30 mass % or less with respect to a total mass of the ink jet black ink:
• general formula (I):
• wherein R1, R2, R3 and R4 each independently represent a hydrogen atom;
• a hydroxyl group;
• an amino group;
• a carboxyl group;
• a sulfonic group;
• an alkyl group having 1 to 4 carbon atoms;
• an alkoxy group having 1 to 4 carbon atoms;
• an alkoxy group substituted with a hydroxyl group, an alkoxy group having 1 to 4 carbon atoms, a sulfonic group, or a carboxyl group;
• an alkoxy group having 1 to 4 carbon atoms which may be further substituted with a carboxyl group or a sulfonic group;
• or an amino group substituted with a phenyl group, an alkyl group, or an acyl group, and n represents 0 or 1.