It revealed the secret of unusual chemical reaction

very interesting and entertaining video. It authors show an interesting chemical reaction. Take a supercooled melt of sodium acetate, which is in contact with the roughness or salt (the skin surface) starts to enter into the reaction, as a result of which the instantaneous crystallization occurs throughout the entire volume to produce heat. The man puts his hand in the jar with water, as here his whole hand and the amount banks are filled with salt crystals, very dense, it even seems that the hand stuck in the bank.

Source: mirfactov.com/