sub standard products
same way non stick wares , like tavas, leave coating after some time. further ,Non stick ware is not harmful for cooking or making any thing, should be guaranteed by food department.
shopkeepers get higher commission or discount on sub standard products.they knowingly sell it.
if any product is sub standard, it should be mentioned by shopkeeper or other plateforms like flip kart.
customer is not so much aware of every thing. more