Different extraction principles of iced Coffee and chilled Coffee

There is a big difference between the two in terms of extraction method and time:

1. Hot coffee is hot water higher than 80 degrees Celsius or above 85 degrees Celsius; Second, it must be extracted quickly, because too slow will make coffee extraction excessive cause miscellaneous taste, and the main substance causing miscellaneous taste is tannin, boiled tannin will decompose into Jiao Wu acid, and tannin is easy to dissolve and decompose in hot water, it is the main culprit causing our coffee to be too bitter, we generally have to be careful to avoid excessive extraction of tannin and caffeine substances, this is our coffee lovers for a longer time know the basic common sense;

2, ice drop coffee is to use must be lower than 5 degrees or even close to the freezing temperature of coffee extraction, so that the various components contained in coffee in ice water is not easy to extract, so we must take a fine grinding slow extraction method, the specific method is to let coffee powder soaked in ice water for a long time, with a very slow drip speed extraction, the general standard speed is 1 drop per second, 45-50 drops per minute, generally takes 8-12 hours. Although it takes a long time to wait, its biggest advantage is that our most hated tannin will not decompose almost completely in cold water, caffeine will decompose in ice water, but it is reduced by about 90% compared with hot water extraction, while the other main components of coffee are the same. Because there is no astringency in the iced coffee, although there is a bitter taste but very little, so the iced coffee in the taste is particularly pure, this is also a long wait compensation.

By comparing the two analyses, you can see that the fundamental difference between hot coffee and iced coffee lies in the difference in extraction temperature and the amount of substances contained in the coffee, not in the final cold or hot drink. Hot coffee can of course be cooled with ice, while iced (or iced) coffee can also be warmed and hot (experts recommend heating it over water to avoid direct heating).

This is also why you want to order a real Dutch iced coffee in a coffee shop or hotel, not only need to book at least one day in advance, but also its price will be much higher than the general hot coffee reason, is the so-called "who knows the liquid in the cup, drops are hard", this is also worth our more light a little silver pay.