They are delicious, but those in order to reduce the cost of corn starch to manufacture sweet potato noodles, and illegally add ammonium alum producers have added a lot of blockage to us. How to distinguish between the noodles in the end does not contain alum more to talk about, then there is no alum in the noodles can be seen?

One: compare the price of alum with or without alum price difference of nearly 10 times

The price of alum is very low, about a few cents a catty, and if you don't use alum, you need to use food glue, emulsifiers, edible waxes and other additives to play the flocculation of alum and brighten the role of alum, the use of alum price of about two or three dollars a catty, and the use of other additives instead of ammonium alum, the price of the price of selling to more than ten to twenty dollars a catty. to more than ten dollars to twenty dollars a catty.

Two: look at the color with alum color bright white

With or without the addition of alum, there are still some subtle differences in appearance. For example, with corn, mung beans, rice flour and other raw materials produced by the vermicelli, should be natural white. If alum is used, the color will be significantly brighter and whiter.

Three: Measure the degree of resistance to cooking soaked in boiling water for five or six minutes

If it is not particularly thick vermicelli, does not contain alum in general, five or six minutes on the obviously soft, and contains ammonium alum vermicelli, but also clearly feel the hardness. In contrast, this method is the most reliable.

The article ends here, if you are interested in other aspects of knowledge, we recommend that you read "Potassium alum citation standards are mainly what? This article, hope to bring you more help.