Acetic Acid (Vinegar, E260)
Acetic acid is the substance that gives vinegar its sour taste and smell. In cleaning it is used as a mild descaler and deodoriser, and in food as an acidity regulator and preservative under the code E260. At the concentrations found in kitchen vinegar it is low risk. Even so, because it is an acid, it must never be mixed with bleach; the mixture releases chlorine gas.
Risk range
1 is the lowest and 10 the highest risk. The range depends on the amount used, whether the product is rinsed off and how it is used. The Temiz İçerik app uses the same ranges.
Kitchen vinegar and diluted vinegar-based cleaners are at the lower end; stronger cleaning vinegars and the risk of splashes in the eyes are at the upper end. Highly concentrated acetic acid (glacial acetic acid or vinegar essence) is corrosive and should be considered outside this range.
Vinegar is a traditional food that has been consumed for thousands of years; there is no safety concern about its use as E260.
What is acetic acid and what is it used for?
Acetic acid is a weak organic acid formed when alcohol is fermented by acetic acid bacteria. Table vinegar contains a few per cent acetic acid in water. It is also produced synthetically in industry.
In cleaning, its acidity allows it to dissolve limescale (calcium carbonate) and soap scum and to neutralise alkaline odours. In food, it adds sourness to pickles, sauces and preserves and acts as a preservative by slowing the growth of microorganisms.
Which products contain it?
- Table vinegar (grape, apple) and cleaning vinegars
- Vinegar-based descalers and bathroom cleaners
- Some glass cleaners and fabric softener alternatives
- In food: pickles, ketchup, mayonnaise, sauces and preserves (E260)
On food labels it is written as “vinegar”, “acidity regulator (acetic acid)” or “E260”. In cleaning products it appears as “acetic acid” or “vinegar”.
Is it harmful? The scientific assessment
The risk depends entirely on concentration. At the level found in kitchen vinegar, acetic acid can sting and redden the eyes but poses no serious hazard. Under the EU CLP classification, concentrated acetic acid causes severe skin burns and eye damage (H314); in very concentrated form it is also a flammable liquid (H226). This is why the warnings on the label should be taken seriously for products sold as vinegar essence or high-strength acetic acid.
Acetic acid is permitted as a food additive in the EU; international assessments (JECFA) have not considered a numerical daily intake limit necessary. It breaks down quickly and completely in the environment.
The most important warning: don't mix it with bleach
Because vinegar is “natural”, it may be thought harmless, but it is an acid. When mixed with bleach, it releases chlorine gas, just like hydrochloric acid. If you feel coughing, burning in your chest or shortness of breath, get to fresh air immediately and call your local poison control centre (in Türkiye: UZEM, 114).
Mixing vinegar with baking soda is not dangerous, but because the acid and base neutralise each other, the cleaning power is reduced.
Which surfaces should it not be used on?
- Marble, travertine and natural stone: The acid dissolves the surface and dulls it.
- Varnished wood and parquet: It can damage the finish.
- Some metals and rubber seals: Prolonged contact can contribute to corrosion.
- Dishwashers and washing machines: Frequent, heavy use can damage some seals; check the manufacturer's recommendations.
What to do when you see it on a label
Vinegar and vinegar-based products are a low-risk option for light limescale and everyday cleaning. When using them, take care not to get any in your eyes and use them on suitable surfaces. If you don't like the smell, citric acid, which does a similar job without the odour, is an alternative. Seeing E260 in food is no cause for concern.
Frequently asked questions
Can vinegar and bleach be mixed?
No. Vinegar is an acid; when it mixes with bleach, chlorine gas is released. Never use these two products together.
Is E260 harmful?
No. E260 is acetic acid, the main component of vinegar. There is no safety concern at the levels used in food.
Is there a difference between cleaning vinegar and table vinegar?
Cleaning vinegars usually contain more acetic acid and are more irritating to the eyes. Check the strength on the label and do not use them in food.
Can vinegar be used on a marble worktop?
It is not recommended. Marble is calcium carbonate; the acid dissolves the surface and dulls it. Choose a pH-neutral cleaner instead.
Sources
Updated: 2026-10-11 · How we score
This page is for general information and is not personal medical advice. Warnings on the product label and the advice of a health professional always come first.