Non-local anti-counterfeiting trademarks will have tin foil.

Supplement:

The salt produced by Guangdong Salt Industry Company is probably low in sodium, high in potassium, rich in selenium and iodine, and the packaging is similar to paper packaging and plastic packaging.

The salt industry company is a national key protected enterprise, and all supermarkets have no autonomy in determining salt. That is to say, you can decide what salt others give you. Moreover, the salt package is often changed, so it is safe to eat and nothing happens.