First, the type of black beans
The outer skin of black beans is black, but according to the color of the beans, they are divided into green kernel black beans and yellow kernel black beans.
1. Green kernel black bean, skin black kernel green, seed umbilicus white, bean grain is relatively round, there is a "black pearl" reputation.
2. Yellow kernel black bean, skin black kernel yellow, bean grain is relatively small, is kidney-shaped, also known as male bean, is a medicinal and food homologous black bean.
Although the appearance is different, their nutritional composition is almost the same, but the anthocyanin content of the green kernel black bean is a little higher than the yellow kernel black bean. In China a few decades ago, there was only one kind of yellow kernel black bean, and the round grain of green kernel black bean was a variety introduced later, with a large yield, mainly for food.
Therefore, if you usually eat it mainly, it is recommended to buy green kernel black beans. If you look at the health value, it is better to prefer yellow heart black beans.
Second, the selection of black beans
In addition to the color of black beans, the skin is black, how to choose? You can judge the advantages and disadvantages by the appearance.
The skin color of black beans is dark, the particles are uniform, very full, shiny, and there is no white powder when rubbed, indicating that it is a relatively fresh high-quality black bean. If the size is uneven, it is more deflated, and the surface is still stained with white powder, indicating that the black beans have been put for a long time and are not fresh.
Normal black beans have a seed umbilicus, which is white, if it is dyed by ordinary soybeans, the whole bean will be black, so if you can't see the white seed umbilicus, it is dyed and can't be bought.
The original melanin of black beans will not fade, but the dye will fade, use black beans to draw a picture on paper, if you can draw black, it is a fake black bean.