How to Test Salt for Adulteration (Chalk Powder, Talcum Powder, Microplastics)

Table salt can be adulterated with chalk powder or talc to increase weight or may contain high levels of microplastics from environmental pollution.

1. The Water Solubility Test (Chalk Detection):
Dissolve a spoonful of salt in a glass of clear water. Pure salt will dissolve completely, making the water transparent. If the water remains cloudy or a white sediment (chalk/talc) settles at the bottom, it is adulterated.

2. The Acid Fizz Test:
Take a small sample of salt and add a few drops of lemon juice or vinegar. If the salt starts to fizz or bubble, it contains chalk powder (calcium carbonate). Pure salt will not react.

3. The Microplastic Check (Visual):
Dissolve a large quantity of salt in a liter of water and filter it through a fine white cloth or coffee filter. Examine the residue under bright light. Tiny colorful "fibers" or glassy fragments indicate the presence of microplastics.

4. The Taste and Smell:
Pure salt has zero odor and a clean, sharp salty taste. If it has a chemical "laboratory" smell or feels "chalky" on the tongue, suspect anti-caking agents or mineral fillers.