Add a little oil to Nitric Acid in a glass and shake. Orange colour indicates the presence of Argemone oil. Add Chillies powder in a glass full of water. Settling of Brick powder at bottom and appearance of red colour indicates adulteration. TEA - Used Tea after colouring is sold as genuine.
Iron fillings are also sometimes present.
Tea concoction prepared from used leaves will not give natural colour and taste would be abnormal. Iron Fillings can be detected with a magnet. Cinnamon is soft, light, thin and has a proper smell whereas Cassia Bark is rough, thick and lesser flavour. Add a little Sugar and Hydrochloric Acid to melted ghee and butter and shake it for five minutes. Presence of Pink colour in Acid shows the sample adulterated.