How to distinguish the oil of underground drainage?

How to distinguish the oil of underground drainage?
Distinguish five major steps of the oil of underground drainage
Find out lightness, pure vegetable oil transparent in shape, in process of production because of sneak into the intersection of alkali and lipoprotein, the intersection of wax and the intersection of quality, impurity,etc. and thing, the transparency will drop; Unless it see color and luster, there are colourless on oil on whose name is pure,in process of production because of in oilPigment dissolve into oil,is it oily can bring color; See precipitate, its principal ingredients are impurity.
Hear the smell two times, each kind of oil has each unique smell. Can drip a few drops of oil on the palm, both hands are closed up and rubed, hear its smell carefully while generating heat. With peculiar smell oil, prove quality to be problematic, have stink on probablyIt is the oil of underground drainage; If there is smell of mineral oil let alone bought.
Taste taste three times, fetch a drop of oil, its taste of having a trial test carefully with the chopsticks. The oil with tart flavor of mouthfeel is a subquality product, there is burnt and bitter tasting oil that frustrates the acid, the oil with peculiar smell may be " The oil of underground drainage " .
Four listen to noise, fetch the intersection of oil reservoir and a few of oil of bottom, scribble at the flammable paper, light and listen to its noise. It is an acceptable product that there is not a noise normally in burning; Burn abnormally and send out " Creakily creakily " The sound, the moisture exceeds standard, it is notAcceptable product; Send out while burning " Pi " Explosion sound, indicate the water content of the oil exceeds standard seriously, and is probably adulterated products, can't buy absolutely.
Five ask source whether ask the intersection of purchase and channel of trade company, ask for the intersection of purchase and invoice or look over local the intersection of food hygiene and superintendent office sample examining report if necessary.
In addition, utilize the relation between density and conductivity of metal ion, passCan judge metal ion in the oil quantity in conductivity of measuring the oil. Numerous experiments show, it is 5 time to 7 time of the first class edible oil to swill water oil conductivity, therefore can recognise and swill water oil accurately.
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