Purple is defined as a deep, rich shade between crimson and violet, or, more broadly, as a range of hues of color between blue and red, or as a dark color that is a blend of red and blue.
Dry ice is the solid form of carbon dioxide (CO2), a molecule consisting of a single carbon atom bonded to two oxygen atoms. Dry ice is colorless, non-flammable, with a sour zesty odor, and can lower the pH of a solution when dissolved in water, forming carbonic acid (H2CO3).
Buy dry ice in block form. Performing school experiments and creating fog effects both require blocks of dry ice. 1  Dry ice also comes in pellet form but is mainly used for dry ice blasting to clean surfaces, or for medical transportation. 2  The price of dry ice ranges anywhere from $1.00 to $3.00 per pound. Plan to pick up dry ice as close to the time you will need it as possible. 2  Since it is constantly changing from solid to gas, it has a very short shelf-life. 3  Every 24 hours, 5-10 pounds of dry ice turns from a solid to a gas.