There are several ways to make fried soybean oil black and bright again:

1, the first method: you can use white radish slices, the center jack, put into a hot frying pan to fry, the white radish will absorb the carbon residue in the oil.

2, the second method: in the hot frying pan, put the egg shell, it will fall in the cooking oil carbon particles adsorption, so that the cooking oil becomes clear.

3, the third method: the eggplant peeled and cut into strips, put into the hot frying pan, immediately you can see the oil very quickly become clear, and precipitation impurities are gone.

4, the fourth method: with cooking soda, oil heated to 2 into the heat, add cooking soda in small increments, adding side by side in one direction, stirring, until clear.

Extended information:

Gutter oil can be divided into three categories:

①is the narrow sense of the gutter oil, that is to say, the greasy floats in the sewers or hotels, restaurants leftovers, leftovers (commonly referred to as swill) through the gutter grease trap slag water separation, Fish greasy float, and then through the heating dehydration, decolorization, deodorization and other processes refined gutter oil;

② is used for deep-fried food oil used more than a certain number of times, and then be reused or add some new oil to the oil used again.

3 is poor quality pork, pig offal, pig skin processing and refining of the output of the oil.

Reference:

Recycled Oil-Baidu Encyclopedia