It contains minerals such as pyroxene, amphibole, feldspar and 63-68 percent silica. The eruption temperature for dacitic lava is 1,500 to 1,800 degrees Fahrenheit. Dacitic to rhyolitic lava is so dangerous because it contains a high amount of crystals.Mt. Vesuvius erupts according to the Plinian model of eruption.
Foil has low emissivity, so will greatly reduce radiative heat transfer (act like insulation). It should face the side that is supposed to be cooler. But foil will not reduce conductive heat transfer, so it must be used judiciously with something that reduces conduction.
Insulation keeps hot stuff hot and cold stuff cold. A blanket is a good example of an insulator - a blanket keeps you warm at night. In the video we tried several different types of insulation (including paper towels, newspaper and aluminum foil) to see which one would do the best job of keeping heat in. You can try anything you like.