|
| Name
of Food Article |
Adulterant |
Simple Method for detection of Common Adulterants |
Remarks |
|
| i.
Sugar |
Chalk
powder |
Dissolve
10 gm of sample in a glass of water, allow to settle. Chalk will settle down at the
bottom. |
|
| ii.
Pithi Sugar |
Washing
soda
Chalk powder |
Add
few drops of Hydrochloric acid, effervescence (give off bubbles) will indicate the
presence of washing soda.
Dissolve 10 gm of sample in a glass of water, allow to settle, chalk will settle down at
the bottom |
|
| iii.
Honey |
Sugar
solution |
A
cotton wick dipped in pure honey when lighted with a match stick burns and shows the
purity of honey. If adulterated, the presence of water will n ot allow the honey to burn.
If it does, it will produce a cracking sound. |
This
test is only for added water. |
| iv.
Sweetmeats, Icecream and beverages |
Metanil
yellow (a non-permitted coal tar colour) |
Extract
colour with luke-warm from food articles. Add few drops of concentrated Hydrochloric acid.
If magenta red colour develops the presence of metanil yellow is indicated. |
|
|
Silver foil |
Saccharin
Aluminium foil |
i.
Taste a small quantity. Saccharin leaves a lingering sweetness on tongue for a
considerable time and leaves a bitter taste at the end.
ii. Take two spoons of liquid sample or about 5 to 10 gms of solid sample with little
quantity of water in a test tube, add few drops of Hydrochloric acid and 10 ml of solvent
ether. Shake well. Decant the ether layer into a test tube or a beaker, evaporate the
ether spontaneously. Add one drop of water (warm) to the residue and taste. Sweet taste
will indicate the presence of saccharin.
Aluminium foil is whitish grey in colour and is readily soluble in concentrated
Hydrochloric acid while pure silver foil is not. |
See Appendix-II. |
