The parent company of Central Dairies says it is aware of complaints surrounding some 2-litre cartons of their Central Dairies 2 per cent milk.
Some consumers have shared social media posts of the inside of milk cartons with a black residue coating the sides of them.
Agropur says it is aware of quality complaints and is taking the situation seriously. The company says the issues experienced do not pose any risk to the health and safety of consumers, and it is making changes that it believes will resolve the issue.
Agropur has not offered any further details on the cause of the issue or how it is being resolved.