Coffee common sense the coffee knowledge that baristas must see in the beginning.

Does coffee make your skin black?

A: so far, there is no study showing an absolute relationship between melanin in coffee and melanin in skin. On the contrary, caffeine speeds up metabolism. Promotes digestion. Improve constipation, from these functions, but also can help the rough skin phenomenon. When it comes to caffeine can speed up metabolism, there is a saying that coffee will accelerate the burning of calories, to achieve weight loss effect; basically the theory is correct, but this burning of calories is not enough to reduce weight, if the coffee also added sugar and creamer, from the calculation of calories is not in line with the principle of weight loss.

How should coffee beans be stored?

A: Improper preservation methods can affect the quality and flavor of coffee. Generally speaking, the shelf life of coffee after opening-coffee beans for four weeks, coffee powder slightly shorter. Vacuum packed coffee beans can last up to four months if unopened. To minimize physical and chemical changes in coffee, packaging for storage is a great science. Buy coffee beans home to store in a sealed container, can be placed in the refrigerator, remember to sprinkle a small amount of salt in the bucket of coffee storage (do not remove the bag of coffee packaging to avoid coffee and salt mix to make coffee taste salty), help to preserve the aroma of coffee.

When buying, it is best to choose a breathable bag with a one-way vent hole on the sealed package, so that the gas of beans or coffee powder can be discharged, but the outside air cannot enter. Since ground coffee has a shorter shelf life than coffee beans, grinding coffee before brewing helps to ensure the freshness of coffee beans and maintain the aroma of coffee.

Does coffee cause calcium loss?

Answer: As for the relationship between caffeine intake and osteoporosis, there is no direct evidence that caffeine causes osteoporosis, but some studies have pointed out that caffeine increases calcium excretion, so the current recommendation is that coffee lovers should eat more foods high in calcium to supplement calcium, if you can drink milk before drinking coffee, It can also reduce the loss of calcium in the body.

Iced coffee (such as Iced Mocha, Iced Cappuccino)

Is it iced coffee beans or coffee beans with ice?

A: iced coffee is brewed with iced coffee beans, and so on after cooling (room temperature) and then add ice is the most appropriate, such as boiled ice cooling words, ice melted too much in the coffee, the coffee becomes too thin. Iced Mocha is a drink made with chocolate syrup added to iced coffee. Mocha means coffee with chocolate. Iced Cappuccino is coffee that contains sugar and milk, plus a special flavor, so the taste is special.

5) Is coffee right when it's hot?

A: Some people say that the best time to drink hot coffee is 85 degrees Celsius, cold is not good to drink. In fact, if it is a good cup of coffee, the taste performance should be consistent when the temperature is high and low, which is why the coffee tester will classify the whole process of coffee from hot to cold as evaluation. A cup of good quality coffee, in addition to the aroma reduction after cooling, the taste performance will even be better than the temperature. Just because of the instability of coffee nature, so some people encourage coffee while it is still hot to drink, to avoid changes after cooling affect the flavor of coffee. To put it another way, when a cup of steaming coffee is placed in front of you, drinking it while it's hot is a courtesy to the coffee maker.

Why can black coffee without sugar feel a little sweet?

Answer: Most people think coffee beans taste bitter. Acid. In fact, raw coffee beans contain about 5%~8% sugar, after high temperature roasting, most of the sugar will be converted into caramel, this caramelization brings coffee a unique brown color, forming a source of flavor and bitterness; while the remaining sugar leaves a slight sweetness, in addition, roasting good quality coffee beans, the release of tannin, and the formation of brown caramel combined with each other, will also produce a slightly bitter sweetness.

Why is it so easy to drink coffee?

A: Many people have the experience of not sleeping because of high spirits after drinking coffee. This is because there is something called adenosine in the human body. It is a conductive substance that controls nerve activity and can slow down breathing. Emotions are weakening. Decreases acid secretion and urination requirements; caffeine contained in coffee, will fake adenosine, so that the body thinks that the effect of adenosine has occurred, but in fact adenosine is not circulating, so there is no suppression effect, so on the contrary, you feel energetic. Increased stomach acid. More frequent urine. Because of emotional excitement, you will feel more awake, naturally it is not easy to fall asleep. It is worth noting that this brief wakefulness caused by caffeine does not mean that physical strength has really recovered. In addition, because everyone's metabolic rate of caffeine is different, the sensitivity to caffeine is also different, so there are still people who drink coffee and don't feel any effect on sleep.

What water should I use to make coffee?

A: About 98%~99% of a cup of coffee is water, so brew good coffee and make wine. Like tea, good water quality can show the aroma of coffee. So drink up more delicious mineral water and coffee whether match? Because mineral water mostly contains sodium. Manganese. Calcium. Magnesium higher hard water, hard water will hinder the release of caffeine and tannin, and make the taste of coffee greatly reduced, in addition to avoid the use of water containing disinfection gas odor, you can use the second boiled water, and early morning just from the tap water, and the most suitable for brewing coffee, should be heated on the gas stove boiled water, this boiling water still has a little carbon dioxide, more able to highlight the delicious coffee.

What is a good cup of coffee?

A: Coffee is a personalized beverage. As long as the beans used are of good quality, fresh and professionally roasted, any coffee that suits your taste is good coffee.

A good cup of coffee does not depend entirely on the origin of coffee beans, brewing methods, etc., but on the personality of the drinker himself, taste preferences. For example, we can often see people drinking large cups of American coffee in American restaurants or movies. American coffee is sometimes described as "sock washing water" because of its weak taste, but these people are happy with it. This shows that the definition of good coffee depends entirely on personal preference and is absolutely individualistic.

What are the "three original species" of coffee?

A: Among the many plants on earth, there are at least 40 species of coffee plants, but the more practical cultivated species are commonly known as the three original species, namely Arabica species. Robustra species. Liberica, and now that's the order of their quality. Arabica species has the best aroma, and its caffeine content is only half of that of Robusta species. At present, Arabica species account for about 70%~80% of the world's total production, while Robusta species are resistant to high temperature. It rains a lot. Little rain, strong adaptability, low cost, yield also has 20%~30% of the total yield, because of poor aroma, bitter taste is strong, except for producing countries and a few Europeans to drink, and not popular.

How do you taste coffee?

A: Drinking coffee should be like tasting a glass of wine (Wine) in general, and careful taste can appreciate its essence.

No matter how the coffee is brewed, there is no need to rush into the stomach. Smell the coffee first, then sip to try the original flavor, then add the right amount of sugar according to personal preference, stir with a small spoon, while stirring the coffee vortex, slowly add creamer, so that the oil floats on the coffee, on the one hand, can keep warm, on the other hand, the heat of the coffee can also evaporate milk fragrance.

Coffee should be drunk hot because its taste and aroma will be reduced as it cools. Drink coffee not only to moderate temperature but also the right amount, generally injected into the cup about seven or eight minutes, the right amount not only makes the taste vivid, but also neat and light when drinking. Follow this taste pattern and the coffee you taste will be even more delicious.

Is black coffee the best way to taste coffee?

A: There is a saying that drinking coffee is, know how to drink without cream. Black coffee without sugar is the connoisseur of coffee. In fact, coffee is not fixed the correct way to drink, coffee hometown of Ethiopia "coffee road", but also to add ginger. Cinnamon and other spices are featured. For a good cup of coffee, black coffee can indeed enjoy its original balanced rich flavor, sugar and creamer can complement some of the coffee's defects, such as creamer can remove some astringency, sugar can be added to change bitterness into sweetness.

Can pregnant women drink coffee?

Answer: In 1980, the US Food and Drug Administration ( FDA) issued a statement advising pregnant or potentially pregnant women to reduce caffeine intake; However, many studies have since shown that there is no evidence that moderate amounts of caffeine will adversely affect the fetus, and there is no medical report prohibiting pregnant women from drinking coffee. However, the FDA has not changed its original advice because pregnant women metabolize caffeine about twice as fast during the second and third periods of pregnancy as they do before pregnancy. Moreover, caffeine can also cross the placenta into the fetus and flow into the baby's body through breastfeeding. Pregnant women and parturient women are advised to be as cautious about caffeine intake as possible.

Why does coffee taste sour?

A: Coffee will drink acid, mostly because of the variety of coffee, some coffee itself higher acidity, such as: Kenya (Kenya), Mocha (Mocha), Colombia (Colombia), Guatemala (Guatemala) and Costa Rica (Costa Rica) and other varieties.

The degree of roasting is also related to the acidity of coffee. Usually, the coffee beans that are lightly fried also contain organic acids, so the coffee that is rushed out is more acidic to drink; while the coffee beans that are deeply fried are released because the organic acids contained in the coffee beans have been released at high temperatures, so the coffee acidity that is rushed out is low. Too much stirring during brewing (especially when brewed with a "plug") or too long for the brewed coffee to sit on the hot plate are causes of sour coffee.

How to buy coffee beans?

No matter what kind of coffee beans, freshness is an important factor affecting quality. When purchasing, grab one or two coffee beans in the mouth to chew, if the crisp sound (indicating that the coffee beans are not wet), the teeth cheek fragrance is the top grade, but it is best to pinch with your hand, feel whether it is solid, rather than buy empty coffee.

If the coffee beans have lost their aroma or smell old, it means that the coffee beans are no longer fresh and are not suitable for purchase.

Freshly fried coffee beans are not suitable for immediate drinking and should be stored for a week in order to completely release the gases in the beans.

Generally speaking, the best drinking period of coffee is one week after frying, when the coffee is the freshest and the aroma (Aroma) tastes the best.

In addition, the purity of coffee beans is also another consideration factor, experts choose coffee, not necessarily to see the size of the particles, but to grab a handful of coffee beans (Regional Coffee), about dozens of weight, to see whether the color of each single bean is consistent, particle size, shape is similar, so as not to buy mixed beans disguised as inferior products. However, if it is a blended coffee, the size and color are different. In addition, heavy fire and medium and deep roasting method will cause coffee beans to be oily, but if the beans are lightly roasted, it means that they have deteriorated, not only the degree of fragrance is reduced, but also astringent and sour. In short, when buying coffee, we should pay attention to its freshness, fragrance and old taste, and the ideal purchase quantity is half a month to drink up.

How do you make the best coffee at home?

A: About brewing coffee knowledge, according to a coffee shop business person in charge said, to be able to fully grasp. Interpretation of the essence of coffee, at least after a year of complete professional training, and currently there is no such training environment, if you want to brew a cup of instant coffee at home, the following has a small secret recipe for you, first put a little warm milk into the pot, and then add the right amount of coffee powder and boiled water (The proportion is about 3g coffee powder plus 140c.c boiling water), heat to a slight boil (note not to boil completely), immediately turn off the flame, and then add sugar according to personal preference. This way, the peculiar smell of instant coffee can be eliminated by the milk at the bottom, and the coffee is more fragrant.