Instant coffee is made of what?
Instant coffee, also called soluble coffee, coffee crystals, and coffee powder, is a beverage derived from brewed coffee beans that enables people to quickly prepare hot coffee by adding hot water or milk to the powder or crystals and stirring. Instant coffee is commercially prepared by either freeze-drying or spray drying, after which it can be rehydrated.
Instant or soluble coffee was invented and patented in 1890, by David Strang of Invercargill, New Zealand, under patent number 3518 sold under the trading name Strang's Coffee.
Close to 50% of the world's green coffee is used to produce instant coffee. As with regular coffee, the green coffee bean itself is first roasted to bring out flavour and aroma. Rotating cylinders containing the green beans and hot combustion gases are used in most roasting plants. When the bean temperature reaches 165 °C (329 °F) the roasting begins. It takes about 8–15 minutes to complete roasting. After cooling, the beans are then ground finely. Grinding reduces the beans to 0.5–1.1-millimetre (0.020–0.043 in) pieces. Until here, the process is in general the same as for other types of coffee.