| Black polyamide resin composition comprising a polyamide resin and coloring agents, wherein nigrosine, aniline black and carbon black are contained as the coloring agents. |
| Ohio-based colour and additive masterbatch manufacturer Americhem Inc has introduced a line of highly concentrated, low-aniline nigrosine black masterbatches. |
| A potential source of exposure to recognised bladder varcinogens arises from induline and nigrosine. |
