How to Dye Fabric Black Naturally - Natural Black Fabric Dyes -Covering rusty iron nails with vinegar will produce a chemical reaction that produces a black dye. Simply fill a non-reactive tub with the nail and vinegar. When ready to dye, remove the nails using a strainer. Other iron hardware - such as hinges, fence parts - can also produce the same reaction. Once the fabric has reach the color desired, the black dye must be set into the fabric using alum to make it permanent.
Supercell is the name given to a continuously rotating updraft deep within a severe thunderstorm (a mesocyclone) and looks downright scary. They are usually isolated storms, which can last for hours, and sometimes can split in two, with one storm going to the left of the wind and one to the right.
Penitentes are a snow formation found at high altitudes. They take the form of tall thin blades of hardened snow, or ice, closely spaced with the blades oriented towards the general direction of the sun. Penitentes can be as tall as a person.