How to check the quality of an antiseptic at home


Despite the variety of disinfectants, there are also counterfeit products that can harm your health. To not doubt the quality

The source Translation for Mixstuff – Svetlana Bodrick

Good hygiene is essential in the fight against COVID-19. This requires antiseptics and masks. However, despite the variety of disinfectants, there are also counterfeit products that can harm your health. In order not to doubt the quality of antiseptic, it is better to investigate it.

you will need

  • Paper towels or toilet paper
  • ball pen. Do not use gel or ink pens.
  • Something you can use to draw a small circle, such as a coin or even an antiseptic bottle cap.
  • A tablespoon of flour
  • Plates or bowls
  • hair dryer

Test using paper towels or toilet paper

Take a small piece of toilet paper and place it on a flat surface. It is important not to lay toilet paper in layers, as it is necessary for the disinfectant to spread on the paper and not to soak into it.

Using a ballpoint pen, carefully draw a circle on the paper, outlining the cap of the coin or hand sanitizer bottle. Make sure the line is continuous, thick and clear.

Place some hand sanitizer in the center of the circle. Try not to drip too much of the product, it should not stretch too far from the line, but too little will not suffice, as the liquid must reach the boundaries of the circle.

Allow the disinfectant to spread in or out of the enclosure. The liquid disinfectant will dissolve almost immediately, while the gel will spread more slowly.

You can do this with a little water to see how a fake alcohol-free antiseptic behaves.


If the disinfectant contains a sufficient amount of alcohol, you will see that the line you drew from the ballpoint pen will be washed off the product and the liquid circulating on the line will be colored with ink. However, if the disinfectant does not contain the required amount of alcohol, the ink does not dissolve and the disinfectant will spread out of the line without staining.

how it works?

This test paper is based on the principle of chromatography. The waterproof ink used in ballpoint pens does not dissolve in water, but dissolves very quickly in alcohol. Reaching the boundaries of the line, the product is colored as the alcohol dissolves the ink. If the alcohol content is small, the ink solubility is insufficient and the line remains unchanged.

Dough test

Place a spoonful of wheat flour on a plate (you can also use corn or other flour).

Add one tablespoon of the antiseptic you want to test.

Mix flour and disinfectant to make dough.


If the product contains too much water, the dough quickly turns tasty and eventually turns into flour. If the antiseptic contains the required amount of alcohol, the dough will not be viscous, but will remain powdery, as a result, the disinfectant will evaporate.

how it works?

Flour and carbohydrates need water to become glutinous, sticky to make the dough gluten. On the other hand, alcohol encounters gluten and carbohydrates for water molecules and prevents them from becoming inflamed and sticky. This test is very accurate and can easily detect counterfeits with an alcohol content of 60 percent or less.

Hair dryer test

Pour a tablespoon of antiseptic into a small bowl.

Pour some water in another bowl.

Using a hair dryer, blow hot air over the product for 30 seconds. Allow the hair dryer to warm up before starting work.

Do the same with water.


If the antiseptic contains the required amount of alcohol, it will evaporate considerably compared to water.

how it works?

This test is based on the principle that alcohol has a much lower boiling point (78 ° C) than water (100 ° C).



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