For the average family of frying, we can note the following to simply identify whether oil is also suitable for re-use.
First, consider the color and smell of the oil to determine whether the oil is still showing a clear and transparent golden yellow, and with a clear flavor;
If you find the darker color of the oil, contains air bubbles, increase viscosity, and there are liable to blistering and smoke, it means the oil has been oxidized and begin to deteriorate, suggest that you should continue to use these oils, should be replaced with new edible oil, do not want to be afraid to waste and damage to health.
In the frying process, food with more water will accelerate the deterioration of the oil quality, and increase the risk of fried, it must pay more attention.
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