Will cosmetics go bad in summer? Generally speaking, they don't.

In hot summer, the storage time of many things will be shortened, so there are many things that need to be kept in the refrigerator. Many girls like to put masks in the refrigerator. So do we need to freeze our cosmetics? Let's take a look today.

Will cosmetics go bad in summer?

Cosmetics will go bad at high temperature. From the moment the bottle cap of cosmetics is opened, its life has entered a "countdown" state. Especially in such hot summer, they will accelerate deterioration. They are afraid of bacteria, sunlight, overheating, supercooling, humidity and failure. Therefore, storing them according to their weaknesses can prolong their service life and slow down deterioration.

How to preserve cosmetics in summer

The storage method of cosmetics is 1. Avoid exposure to the sun.

No matter what kind of products, exposure must be taboo. Exposure to high temperature will not only lead to product activity failure, but also increase microbial derivatives and damage the skin. Never put skin care products and cosmetics in the car. In hot weather, the car is the hottest place. It is estimated that you will be killed in the car in less than half a day.

PS。 Paste products are easy to soften under the influence of high temperature. If it is exposed to the sun, it is basically scrapped directly.

Method of storing cosmetics II. Avoid water vapor.

Cosmetics, skin care products and make-up products should not be left in the bathroom for a long time. The bathroom itself has heavy water vapor, so it is easy to get hot when taking a bath. Both are not very friendly to the quality of cosmetics and skin care products.

Methods of storing cosmetics. Mark date

If you are a pickpocket who likes to buy in buy buy and can't stop, remember to write down the opening date when opening the bottle to avoid the phenomenon of expiration after the date. Many products generally have a shelf life after opening a bottle.

How to judge whether cosmetics have deteriorated?

(1) smell it.

The fragrance of cosmetics, whether elegant or strong, should be very pure. The strange smell emitted by the deteriorated cosmetics masks the original fragrance of the cosmetics, which is sour, spicy, sweet and greasy, or ammonia, which is very unpleasant. Some nutritional cosmetics are easy to go bad, such as ginseng cream and pearl cream.

(2) Look at the color

Qualified cosmetics have natural color and pure paste, and make-up cosmetics are gorgeous and pleasing to the eye. Deteriorated cosmetics are black and dirty with different shades, often with different spots or turning yellow and black. Sometimes even flocculent filaments or fluffy cobwebs appear, indicating that they have been contaminated by microorganisms. Some cosmetics with special effects are prone to discoloration, such as acne cream and anti-wrinkle cream.

(3) Look at the texture of the cream

The texture of the deteriorated cream will become thinner, and the water can be seen to overflow from the cream with the naked eye. This is because many cosmetics generally contain starch, protein and fatty substances. Excessive combustion of microorganisms will decompose these protein and fat, destroy the original emulsified state of cosmetics, and thus precipitate the water originally contained in the emulsified structure. Sometimes, even under aseptic conditions, such as long-term supercooling or overheating, oil-water separation will occur in cosmetics. In addition, the deteriorated cream paste may swell, which is caused by the gas generated by the decomposition of some components in the product by microorganisms. In severe cases, the generated gas will even make the bottle cap of cosmetics burst and make cosmetics overflow.

(4) By touching

Qualified cosmetics will feel smooth and comfortable when applied to the skin, and will not be sticky or greasy. Deteriorated cosmetics feel sticky and rough when applied to the skin, giving people a feeling of smearing dirt, sometimes feeling dry, burning or painful skin, often accompanied by itching.

Can expired cosmetics still be used?

It is best not to use expired skin care products. The main problem of skin care products beyond the shelf life is microbial contamination. After skin care products are exposed to the air for a long time, the active ingredients in them will change, causing potential harm to the skin. Therefore, no matter from the perspective of safety or effectiveness, skin care products should be used up within the validity period. Try to avoid using it after expiration, otherwise it will easily cause skin discomfort and allergies.