Can be eaten, walnuts kernel color is white, no mold or sour or odor when, can be eaten.?

The reason for the black color of walnut kernel skin:

Walnuts have three layers of skin, a layer of green shell, a kind of shell, a kind of walnut kernel seed coat, in fact, there is another one called distraction wood. Walnuts on the market you see the shell should be the shell of the finished product shell blackened there are two possibilities:?

The first is: because walnuts in the picking, the shell is damp, or green shell is not cleaned up, or walnut sun screen or baked when not in place and caused by localized dampness, it will be left in the shell of the mountain of the black block, but the inside is white.?

The second is: because the inside blackened caused by the outside blackened, the reason is that the old goods or moisture, or inside the mold and other deterioration. Your case belongs to the first kind, you can eat normally. And it can be proved that the walnuts you bought (at least this walnut) have not been bleached with sulfuric acid, hydrochloric acid, hydrogen peroxide, etc.

Expanded Information:

By the quality of walnuts kernel good and bad divided into four grades: the first road cargo requirements walnut kernel For kernel, kernel color is light yellow or light amber; two-way goods require walnut kernel for a quarter of kernel, kernel color with the head of the road goods; three-way goods for the broken kernel, kernel color can be as deep as amber; the other mixed end of the kernel for the four-way goods. Each road goods to be packaged separately, write a good mark.

Walnut kernel shape fat and plump, kernel color yellow-white, meat white and fresh, large and complete piece of this quality is best, buy walnuts must pay attention to yo!

People's Daily News - how to identify walnuts good and bad these details you look good