... as crystals or crystalline powder, which may vary from white to pale yellow in colour depending on the grade of material being ... -2-Nitro-1, 3-Propanediol (Bronopol) is readily soluble in water although the dissolution process is endothermic. Solutions containing up ... -Bromo-2-Nitro-1, 3-Propanediol (Bronopol) is widely used in industrial circulating water, algae-killing, paper pulp, paint, plastic, ...