Yes, the appearance of sour flavor is bad, can no longer be consumed.
The way to judge the good and bad of rambutan:
1, rambutan fruit is spherical or ovoid, the surface of the pericarp has a tortoise shell pattern, and a concave groove, hidden seeds, the color of the ripe fruit is bright red or slightly yellow.
2, in the purchase of rambutan with lychee, to see whether its appearance is beautiful, whether the skin color is bright red, the appearance of fresh fruit, the quality of taste naturally fresh. To stay skin surface pilose red with green fruit quality is best.
3, when buying and selling should pick the soft thorns long and fresh, no black spots on the outside of the fruit body, large and well-proportioned grains, thin skin and thick flesh is the best.
Extended information
Ruby (Latin name: Nephelium lappaceum L.), also known as: hairy lychee, shaozi, red hairy fruit, red hairy gallbladder; Southeast Asia's native Sapindaceae large tropical fruit trees, Malay "rambutan", meaning "rambutan". ", meaning "hairy things". Ripe rambutan fruit is not always red, there are also yellow fruit. Some rambutan fruits have a core the size of a sesame seed. The flavor of rambutan is similar to lychee. The area planted with rambutan in China is relatively small, and only Baoting and Sanya on Hainan Island grow large areas of rambutan in the whole of China.
Rhubarb is one of three genera of shaozi produced in China, the other two being shaozi and Hainan shaozi.
The pulp of rambutan contains glucose and sucrose, and is rich in vitamins, amino acids, carbohydrates and many minerals. Its taste sweet and warm, the flesh is fragrant / sweet and thick and juicy, and some people call it China Lingnan's lychee, more hairy lychee alias.
Rhubarb pulp yellow-white, translucent, juicy, crisp flesh, taste sweet or sweet and sour, or fragrant. Fruit meat ratio of 31 ~ 60.2%, total solids 14 ~ 22.2%, sugar 3.61 ~ 6.25%, citric acid 0.39 ~ 1.53%, vitamin c 100 grams of flesh containing 0.63 ~ 5.5. rambutan excellent varieties of fruit large, thin skin, nucleus of small meat thick, meat and nucleus separation, crispy sweet and tasty meat.
References? Baidu Encyclopedia-Red Hair Dan