Poisonous mushroom

Good day my dear friends!
I'd like to show you this mushroom - white grebe. It can not be collected in the forest and in places where it grows.
This is a poisonous mushroom and they can go very much.
At home, there is a very easy way to check the edible mushrooms or they are inedible.
In those fungi in which you doubt and are not sure if they are edible, they can be put in a pot, cover with water and throw in the onions.
If the bow of the white turns into blue, it means that all the mushrooms in the pan it is necessary to throw out. Otherwise you will get poisoning.
This method of verification is given by scientists biologists who are engaged in the study of fungi. Therefore, listen to the advice and do not risk, so as not to harm your health.