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Video of hot water being poured into a "magic mug" and the subsequent colour change A promotional magic mug filled with a hot liquid (left) and empty (right). A magic mug, also known as a heat changing mug, transforming mug, or disappearing mug is a mug that changes color when it is filled with a hot liquid.
Thermochromic paints are seen quite often as a coating on coffee mugs, whereby once hot coffee is poured into the mugs, the thermochromic paint absorbs the heat and becomes colored or transparent, therefore changing the appearance of the mug. These are known as magic mugs or heat changing mugs. Another common example is the use of leuco dye in ...
Most are based on a combination of acid (usually a low molecular weight organic acid) and a salt of bicarbonate (HCO 3 −). After they act, these compounds leave behind a chemical salt. Chemical leavens are used in quick breads and cakes, as well as cookies and numerous other applications where a long biological fermentation is impractical or ...
From the earliest finds, opium appears to have had ritual significance, and anthropologists have speculated ancient priests may have used the drug as a proof of healing power. [71] In Egypt, the use of opium was generally restricted to priests, magicians, and warriors, its invention is credited to Thoth, and it was said to have been given by ...
Ammonium carbonate is a chemical compound with the chemical formula [N H 4] 2 C O 3. It is an ammonium salt of carbonic acid. It is composed of ammonium cations [NH 4] + and carbonate anions CO 2− 3. Since ammonium carbonate readily degrades to gaseous ammonia and carbon dioxide upon heating, it is used as a leavening agent and also as ...
Putting a non-microwave-safe material in a microwave oven can lead to chemicals leaching into your food (not good) or the melting of the container, which can lead to burns — or, at the very ...
Microfoam may also be used in a steamer (a "coffee-free" cappuccino), though this can instead be made with dry foam. As it requires a skilled barista to produce microfoam (especially when used for latte art), it is a sign of attention to quality, and a defining characteristic of the third wave of coffee .
Superheating is more likely after repeated heating and cooling cycles of an undisturbed container, as when a forgotten coffee cup is re-heated without being removed from a microwave oven. This is due to heating cycles releasing dissolved gases such as oxygen and nitrogen from the solvent. There are ways to prevent superheating in a microwave ...