The white hair on the surface is bad and cannot be eaten. See if ginger is bad. You can peel it off to see if it is yellow and fresh. Not bad, soft and white. It is best not to use it. Ginger will undergo a series of chemical changes in the process of decay. Among them, safrole, a toxic substance, is a highly toxic organic substance, which can denature liver cells, even if it is ingested in a small amount, it is enough to cause very serious damage to liver cells. So throw away the rotten ginger and don't eat it. In addition, in order to prevent fresh ginger from rotting or shrinking, you can put semi-wet sand in the old washbasin or flowerpot, then bury fresh ginger in the sand and sprinkle some water on the sand frequently. Don't sprinkle too much or too little water.