This form is unattested elsewhere, though *nigricire did give rise to other substantival forms such as noircissement and noircissure (FEW *nigricire 7,138a).
(
1485
)
come tanners es diverses parties d'icest realme usent deinz soi mez le mestier de coriance et noirance dez quirs insufficialment [...] lez quirs si insufficialment overez si bien en tannure come en coriance et noirance [...] mittent a vendre as diversez feires et marchés
ii 502
[neirance] (1485)