- nigeranA polysaccharide found in black mold, Aspergillus niger.
- nigranilineA complex, nitrogenous, organic base and black dyestuff
- nigrineA black ferruginous variety of rutile, or a compound of rutile and ilmenite.
- nigriteAn insulating material consisting of the impure residuum obtained in the distillation of paraffin.
- nigrosineA dark blue synthetic dyestuff of the induline group.