White mushrooms are rich in nutrients, rich in plant fiber, for friends with constipation is a very good food, many people do not know how to choose when buying white mushrooms, think that white, smooth white mushrooms are good, is this really the case? Let's take a look at how to identify white mushrooms that have been bleached!
Ways to identify bleached mushrooms
1, look at the color
During the picking process, the roots of white mushrooms are easy to carry soil, and the injured parts often turn brown, and they are easy to bump during transportation, so they will not be uniform pure white. Normal white mushrooms are white or a little gray, if the color is too white and bright, it may be bleached by the vendor, can not buy, can not eat. White mushrooms that are yellow or black cannot be bought, and this white mushroom is not fresh or contaminated.
2. Touch with your hand
White mushrooms that have not been bleached, the surface will have an astringent, rough and dry feeling when touched by hand, and the poisonous white mushrooms that have been bleached are completely different, and there is a smooth and wet feeling on the top when touched by hand, and the amount is heavier than normal white mushrooms.
3. Smell the taste
Normal white mushrooms smell pure mushroom smell, if there is a pungent smell may be bleached, sour, musty or smelly white mushrooms can not be bought.
4. Fluorescent illumination
Some white mushrooms also contain fluorescent brighteners, and if you look at the dark with ultraviolet light to detect counterfeit banknotes, you will find very obvious fluorescent spots on them.
What are the dangers of bleached white mushrooms?
1. In order to make the mushrooms look fresher and whiteer and longer to store them for a longer time, use sodium metabisulfite to bleach the white mushrooms to preserve freshness. The main use of sodium metabisulfite is bleaching and antiseptic, which has obvious irritating effects on the skin and mucous membranes, and can cause conjunctival and bronchitis.
2. People with allergies or asthma are very sensitive to this. Direct skin contact can cause burns.
3, if the excessive intake of metabisulfite, will cause greater harm to the human body, it will affect the body's absorption of calcium, but also destroy the B vitamins, causing diarrhea, severe will poison the liver, kidneys.
Finally, many people think that the white mushroom itself is pure white, in fact, the white mushroom is not pure white, but slightly yellow, especially the color of the wound will be darker yellow; the bright white white mushroom is very popular with consumers, but few people know that it is a bleached poisonous mushroom, and long-term consumption will bring you irreparable harm.