Wheat flour: Chalk powder, plaster of Paris, burnt bones, potato flour, maize and rice flour.
- When you mix wheat flour in water chalk powder settles down.
- The chapattis or rotis prepared from adulterated wheat flour tastes insipid.
Colored saw dust – Add few drops of conc. HCl to one tsp of turmeric powder. If the pink color develops and disappears then it is not adulterated. If the color persists then turmeric powder is adulterated.
Chalk powder or yellow soap stone: Use effervescence test by adding HCl to turmeric water. Presence of bubbles indicates presence of chalk or soap stone.
Brick powder, salt or talc powder: Mix chilli powder in water and see the color change of water and also look for any sedimentation indicating the adulteration
Artificial color: Sprinkle chilli powder on glass of water and see whether there is color separation in water.