Heidi Norton
Mixing perfume with water is possible, but it is generally not recommended. While some sources claim that adding water to perfume can make the scent last longer and appear stronger, others argue that it dilutes the fragrance oils and may cause the perfume to go bad more quickly due to the growth of bacteria. Additionally, water may cause solubility issues with the aroma molecules, which are more likely to be soluble in alcohol. If you want to add a liquid to your perfume, it is suggested to use alcohol, such as vodka or perfumer's alcohol, instead of water.
| Characteristics | Values |
|---|---|
| Effect on evaporation | Water retards the evaporation of alcohol, giving the top notes greater persistence. |
| Effect on scent | Water can make the perfume cloudy and may decrease the scent's strength and longevity. |
| Effect on bacteria | Water can cause bacteria to build up over time. |
| Solubility | Water and alcohol are soluble with each other, but aroma molecules are more likely to be soluble in alcohol than in water. |
| Common practice | Professionals may add a few percent of water to decrease the vapor pressure of the water-alcohol mix and slow evaporation. |
| Suggested alternatives | Alcohol, beer, whiskey, or decorative beads. |
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What You'll Learn
Water makes perfume go bad faster
Water and alcohol are completely soluble with each other. However, they do not mix at a molecular level. Aroma molecules are more likely to be soluble in alcohol than in water. There are only a few aroma chemicals that are soluble in water.
Adding water to perfume dilutes the perfume oils, and you will not get a real idea of how long the fragrance lasts or projects. Water also increases the chances of solubility problems.
If you are making perfume at home, you can add a small amount of distilled water (20 drops). However, this is optional because distilled water can make your perfume cloudy.
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Water dilutes perfume oils
If you are looking to dilute perfume oils, there are other options besides water. One can use perfumer's alcohol, which is mostly denatured ethyl alcohol with additives that help oils become more soluble and promote absorption. Other options include Everclear, 95% Grain Alcohol, or Club 190, which can be purchased at liquor stores. If you are looking for a natural perfume, one can use essential oils, which are easy to measure out and blend.
If you are creating a fragrance blend with natural ingredients, you will need to compound your fragrance without the use of certain materials. This involves starting with robust materials that need to be heated and then adding the rest in order of volatility once removed from the heat. Some materials may need to be warmed slightly to mobilise, and this can be done carefully using a water bath.
There are also other diluting agents that can be used, such as propylene glycol, which is commonly used in the fragrance industry to dilute insoluble materials. Additionally, carrier oils can be used for oil-based fragrances, although they will not aid in evaporation.
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Water decreases perfume's vapor pressure
Perfumes are a mixture of fragrance oils and alcohol. Water is also a common ingredient, with some perfumes containing about 3-20% water.
Water and oil do not mix, but when alcohol is added, they become soluble with each other. However, aroma molecules are more likely to be soluble in alcohol than in water.
Some professionals add a few percent of water (approximately 4%) to perfumes. This decreases the vapour pressure of the water-alcohol mix, slowing down evaporation. This makes the perfume last longer on the skin.
Water also reduces the harsh, drying effect of alcohol on the skin. However, adding too much water can cause solubility problems with the fragrance.
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Water makes perfume cloudy
While it is possible to mix perfume with water, it is not recommended. Water and alcohol (ethanol) are completely soluble with each other, but they do not mix at a molecular level. Aroma molecules are more likely to be soluble in alcohol than in water. Adding water to an alcoholic solution of fragrance materials increases the chances of solubility problems.
Water also dilutes the perfume oils, so you won't know how long the fragrance will last or how it will project. Water can also make perfume cloudy. If you are making your own perfume, you can add 20 drops of distilled water, but this is optional as it often makes the perfume cloudy.
If you are looking to dilute your fragrance to get a few more uses out of it, it is recommended to use alcohol instead of water. Alcohol is a preservative, and in water, bacteria and other contaminants can build up over time. You can use perfumer's alcohol, which is mostly denatured ethyl alcohol with additives that assist in making the oils more soluble and promote absorption. You can also use grain alcohol or vodka.
If you are concerned about cloudiness in your perfume, it may be due to particulates in your fragrance oils. If you leave your blend alone for a few days and it turns clear, then the particulates have settled to the bottom. You can then filter the final blend before using it.
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Water is not a good substitute for alcohol
While some perfumes do contain water, substituting water for alcohol is not recommended.
Firstly, water is not an effective preservative. Alcohol acts as a preservative, preventing the fragrance compounds from breaking down. This makes alcohol-based perfumes suitable for long-term use, as their scent does not change much over time. Water-based perfumes, on the other hand, struggle to maintain scent stability as water does not preserve scent molecules as effectively as alcohol.
Secondly, water-based perfumes often require more fragrance oils to be effective. As a result, they are typically more expensive to produce.
Thirdly, the addition of water can cause solubility problems. Aroma molecules are more likely to be soluble in alcohol than in water.
Finally, water-based perfumes may not be as appealing to consumers. Some consumers perceive alcohol-free perfumes as more 'natural', but they may need to accept a wetter application. Alcohol evaporation in perfumes is what gives the fragrance flight, or sillage. The alcohol renders the scent molecules airborne, providing an intense burst of aroma. Water-based perfumes, meanwhile, evaporate more slowly, leading to a softer aroma.
For these reasons, water is not a good substitute for alcohol in perfumes.
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Frequently asked questions
It is not recommended to mix perfume with water as it dilutes the perfume oils and you won't know how long the fragrance will last.
Water retards the evaporation of alcohol, giving the top notes greater persistence. Water can also make the scent stronger as it helps release the scent from the oil.
It is recommended to add 20 drops of distilled water to a 10ml atomizer bottle. However, adding water is optional as it can make the perfume cloudy.
You can use perfumer's alcohol, which is mostly denatured ethyl alcohol with additives that help make the oils more soluble. You can also use other types of alcohol such as vodka or whiskey.
It is possible that the perfume was a display model and was used before you purchased it. Alternatively, some perfumes contain decorative beads to raise the fluid level without dilution.
