Food Article
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Adulterant
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Simple Method for
Detecting the Adulterant
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Milk
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Water
Urea
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Put a drop of milk
on polished vertical surface. The drop of pure milk either stops or flows
slowly leaving a white trail behind it. Whereas milk adulterated with water
will flow immediately without leaving a mark.
Take
5 ml of milk in a test tube and add 2 drops of bromothymol blue soln.
Development of blue colour after 10 minutes indicates presence of urea.
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Ice Cream
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Washing Powder
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Put some lemon
juice, bubbles are observed on the presence of washing powder
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Sugar
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Chalk
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Dissolve sugar in a
glass of water, chalk will settle down at the bottom, similarly for salt
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Honey
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Water
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A cotton wick
dipped in pure honey burns when ignited with a match stick. If adulterated
presence of water will not allow the honey to burn, if it does will produce a
cracking sound.
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Tea
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Coloured leaves
Used tea
Iron
fillings
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Rub leaves on white paper, artificial
colour comes out on paper.
Tea
leaves sprinkled on wet filter paper. Pink or red spots on paper show colour
Move
a magnet through the sample. Iron will stick to the magnet.
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Red Chilli Powder
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Rodamine Culture
Brick Powder
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Take 2gms sample in a test tube, add
5ml of acetone. Immediate appearance of red colour indicates presence of
Rodamine.
Brick powder settles fast
chilli powder settles slowly when put in water.
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Pure Ghee or Butter
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Vanaspathi
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Take one
teaspoonful of melted ghee or butter with equal quantity of Conc.
Hydrochloric acid in a test tube and add to it a pinch of cane sugar. Shake
well for one minute and let it stand for five minutes. Appearance of crimson
colour in lower layer shows the presence of vanaspathi.
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Black Pepper
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Papaya Seeds
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Float the sample in
alcohol. The mature black pepper berries sink while papaya seeds and light
black pepper float.
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Common Salt
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White powdered
stone
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Stir a spoonful of
sample salt in water. Chalk will make the solution white and other insoluble
impurities will setlle down.
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