To identify "gutter oil" consumers should learn to identify sensory. According to experience, edible vegetable oils can be identified by looking, smelling, tasting, listening and asking five aspects.

1. Look at the transparency, pure vegetable oil was transparent, in the production process due to the mixing of alkali fats, waxes, impurities and other things, the transparency will be reduced; look at the color, pure oil is colorless, in the production process due to the pigments in the oil dissolved in the oil.

2. Each oil has its own unique odor. You can drop one or two drops of oil on the palm of your hand, rub your hands together, and carefully smell its odor when it is hot. There is an odor of oil, indicating that the quality of the problem, there is a foul smell is likely to be gutter oil; if there is the smell of mineral oil can not buy.

3. Use chopsticks to take a drop of oil, carefully taste its flavor. The oil with a sour taste is a substandard product, the oil with a burnt bitter taste has been rancid, and the oil with a strange odor may be "gutter oil".

4. Take one or two drops of oil from the bottom of the oil layer, apply it to a flammable piece of paper, light it and listen to the sound. Normal combustion without sound is a qualified product; combustion is not normal and issued a "squeak" sound, moisture exceeds the standard, is not qualified products.

5. Ask the merchant's purchase channel, if necessary, ask for purchase invoices or check the local food hygiene supervision department sampling test report.

6. In addition, the use of metal ion concentration and conductivity of the relationship between the conductivity of the oil through the detection of oil can determine the amount of metal ions in the oil. Multiple experiments have shown that the conductivity of driving oil is five to seven times that of first-class cooking oil, from which driving oil can be accurately identified.

The dangers of gutter oil:

Gutter oil is a very poor quality, extremely unhealthy non-edible oil. Once consumed "gutter oil", it will destroy people's white blood cells and digestive mucosa, causing food poisoning, and even carcinogenic serious consequences. Therefore, "gutter oil" is strictly prohibited for use in the field of cooking oil.

Extended information:

Related cases:

In March 2011. In Group 1, Dengta Village, Jiema Town, Jiulongpo District, Chongqing Municipality, an abandoned pig farm called "Horse Factory" was frequented by several strange men, who brought in a boiler and set up a cooker to boil the driving rain that was pulled back from outside the village every day.

April 20, the police in the town police station was informed, in the pig farm will be Lao Cao and other six people arrested. This is the largest "gutter oil" case in the southwest region.

The Chongqing police investigation, found that Lao Cao from the driving rain boiled extracted "gutter oil", rolling Chongqing, Sichuan and other regular cooking oil production enterprises, into the wholesale market of fats and oils, according to different ratios of mixing into the genuine cooking oil, and finally to the table.

The Ministry of Public Security will be listed as a "4-20" special case, the police followed the trail, uncovered the local "gutter oil" black industrial chain, cracked the southwest region's largest-scale production and sale of "gutter oil "case.

Baidu Encyclopedia - Gutter Oil