Where It Comes From
Made for azo dyes/pigments; can be released when some dyes break down; industrial waste streams [1][3].
How You Are Exposed
Breathing dust or getting it on skin at work; handling old lab test kits/reagents; contaminated air, dust, or water near production or waste sites [2][3].
Why It Matters
Classified as possibly/anticipated to be carcinogenic; causes tumors in animals; can irritate skin/eyes and be absorbed through skin [1][2].
Who Is at Risk
Dye/pigment workers; lab or clinical staff using legacy peroxidase color reagents; maintenance/cleanup crews; people near dye/pigment facilities or hazardous waste sites [2][3].
How to Lower Your Exposure
At work, use closed systems, local exhaust, chemical‑resistant gloves/clothing, and good hygiene; substitute safer reagents; review your SDS. In communities, avoid old reagents, follow disposal guidance, and test private wells if near facilities [2][3].
References
- [1]IARC Monographs. o‑Dianisidine and o‑Dianisidine‑based dyes. WHO/IARC (e.g., Vol. 100F).
- [2]NTP, Report on Carcinogens. o‑Dianisidine and dyes metabolized to o‑dianisidine (15th ed.).
- [3]U.S. EPA. Action Plan for Benzidine Dyes and o‑Dianisidine Dyes (TSCA).