* Right: in
a blister observe some grains of sugar, salt, citric acid and Dead
Sea salt.
* Left: Your tongue
helps you to distinguish between sweet, sour, salty (and bitter).
* Use your wet fingertip to
bring one granule of the first sample on your tongue.
* Do the same with the other
white substances.
Remember: Never ever test unknown substances with you tongue!
Remember: Always write the name of
a substance on your container before filling it.