How to see the difference between new beans and old beans?

Generally speaking, fresh coffee beans harvested that year are called "New Corp", those harvested the year before last are called "old beans" (Past Corp), and those placed for more than a year are called "old beans" (Old Corp). This distinction is mainly due to the water content of raw beans, because the new beans have more water content (usually between 11% and 13%) and are mostly dark green in appearance, while the old beans (10%-11%) and old beans (9%-10%) are lighter in color, lighter in weight and less glossy and tactile as the surface of the new beans. Of course, different processing and refining methods and producing areas, varieties of raw beans will be different.

From ripe "coffee cherries", refined by washing or drying into raw beans, the water content is usually between 9% and 13%, and it is not easy to bake if the water content is too high or too low.

To judge whether the raw beans are fresh or not, we can see the appearance of the coffee raw beans and whether the color is bright green and shiny. Most raw beans treated with water will be emerald green as long as they are fresh.

The smell of coffee and raw beans

In general, if the beans are not washed, such as sun-treated mocha, wet planing and so on, it may be difficult to tell how long the beans have been kept by their appearance, but the smell absorbed by raw beans provides a very obvious clue. When fresh, the smell of water-washed raw beans is fresh grass, while that of dried mocha beans is fermented with ripe fruit, and the smell of Mantenin in wet planing is less obvious. but do not have a bad smell of wet rot, such as stinky tofu.

The water content of raw beans will affect the baking time and the degree of difficulty to control. Usually, the baking time of new beans is longer and harder to control than old beans. Of course, coffee raw beans are usually as fresh as possible. Fresh coffee raw beans are full of vitality. Semi-fresh raw beans, with a little bit of stability in the vitality. Eight months later, the raw beans lost their vitality. Raw beans for more than a year are old and boring, but this does not include some specially treated beans and special preservation environment, such as aged coffee beans, wind-stained coffee beans and so on.

Aged coffee beans (Aged bean) refers to the natural aging of raw beans (usually 2-3 years) by prolonging the storage time. These changes include weakening acidity, changing color and thickening the quality of beans. Of course, it is not just for a few years. The storage environment must be cool and ventilated.

Because of the dark and long-term storage environment, old coffee is always difficult to get rid of complex flavors such as moldy or commonly known as sacks or leather. Correctly stored coffee beans will change their taste and shape, such as weakening acidity, dark color, lack of moisture, thicker and thicker taste, and sweetness with honey flavor.

Under the condition that it must be strictly and carefully controlled during storage, the timing should be flipped evenly, and the humidity and ventilation should be adjusted to prevent moth or mildew.

Generally speaking, the storage of aged beans does not take place in the producing area or manor, but is the business behavior of raw bean dealers or brokers.

Wind-stained coffee beans

Wind-stained coffee is also called monsoon coffee.

Monsoon coffee usually needs to be made with sun beans. The factory where beans are stored faces to the west. The beans are laid flat in the field, and the windows are all open to catch the salty monsoon from the southwest. After reaching a certain extent, put it into the bag, but the coffee beans should not be too full, and the coffee bags should not be piled too dense so as not to be airtight and moldy, and it is time-consuming and labor-consuming to pour out coffee beans and replace sacks from time to time to avoid mold. This period of time is about 12 to 16 weeks, and after it is ripe, it will be fumigated to drive out the weevil, and finally to sift out the failed beans that have not turned golden.

After at least six months to a year of monsoon blowing, the quality and quantity of beans have changed significantly. Coffee beans will swell to twice their size, reduce their weight and density, and have a moisture content of about 13%.

Monsoon coffee is in a short period of 3-4 months, through exposure to the monsoon so that the rapid loss of water in raw beans, in order to achieve the purpose of aging. The age of monsoon coffee beans is young and strong.

Old coffee = "old beans"?

Old coffee beans do not mean that coffee beans are not allowed after they have been kept for a long time, because coffee beans will rot after they have been kept for a long time, changing from fresh cyan to white, then to yellow, becoming dull, and even growing worms. Like aged wine, raw beans must be properly processed and stored for a long time before they can be called real aged coffee.

Changes in freshness of raw beans:

New season beans > overdue season beans > old beans > old beans

New season beans: raw beans harvested within one year

Over-yielding seasonal beans: more than one year.

Lao Dou: more than two years

Chen Niandou: for deliberate production, it has been stored for more than three years.