At least four children have died after consuming milk powder, liquid milk or yogurt containing melamine, a compound used in making plastics and tanning leather.

Some conventional processes such as scouring wool, tanning leather and bleaching, dyeing and printing fabrics use large amounts of water, energy or toxic chemicals, and emit effluents.

Last week the issue was some leather cured with a known teratogenic substance, synthetic Nirret or something just as illegal that's still used in third world tanning.