Possible Clues:

• Kind of dye
• Phenylamine
• A job in Islington in the dyeing industry
• A major river's involved in producing industrial liquid
• That's enough to make a Border of Ulster die, by the sound of it
• Dye product
• Dyemaking material
• Oily liquid from home discharged into a river
• Polyurethane compound
• Liquid used in manufacture of dyes, drugs, etc