You will need
  • - sulfuric acid;
  • - litmus paper;
  • - matches;
  • - a glass.
Pour 30-50 grams of vodka into a glass, add exactly the same amount of sulfuric acid. If the mixture became black, then vodka dangerous to your health, it must immediately be poured.
Some forgers are adding sulfuric acid in a weak vodka to enhance the strength of the drink. To determine the quality of vodka you'll need a litmus test. Pour a small amount of vodka, which caused suspicion and put in it a litmus test. If the paper has become red, a vodka drink should not be, because it contains large amounts of acids hazardous to your health.
Carefully pour the vodka into a bottle cap and ignite. Good vodka 40 degrees will burn with a blue flame. If vodka is not lit or flashing on the contrary as gasoline - it is worth considering. This vodka is better not to drink.
Buying a bottle of vodka, shake it. If the bubbles are large, then vodka is highly diluted with water. If small bubbles rise up the snake, this indicates a good quality vodka.
Opening a bottle of vodka, try to inhale it, as they say, full chest. If you feel sharp unpleasant and does not smell of vodka – this vodka should be abandoned. Perhaps the vodka has a touch of acetone or made from industrial alcohol. So better not to risk your health.
There is another old method of checking the quality of vodka. Take a bottle of vodka and try to freeze it at -20 degrees. If the bottle has at least small pieces of ice – it is said that she diluted with water. Of course, this vodka is better not to use it.