Generally speaking, the fading of black sesame in the process of elutriation does not necessarily mean dyeing, nor does it mean that the ingredients bought are poor, and some are normal. Because black sesame contains anthocyanin, anthocyanin is a water-soluble natural pigment, which is generally stored in plant cytosol cells. When the cells of black sesame are damaged, anthocyanins will dissolve in water, resulting in the water turning black. Therefore, when soaking black food such as black sesame seeds, it is normal to find that the food becomes shallow and the water turns black.
However, it should be noted that some black sesame seeds that have been placed for a long time or stored improperly will fade and be more easily broken after soaking in water. Even the color of water is dark black, indicating that the freshness of black sesame is poor, and it may be contaminated by mold, so we need to be vigilant and eat it carefully.
Method for identifying whether black sesame is dyed or not
1, look at the color of sesame.
If all black sesame seeds are black and shiny, and the black is particularly uniform, it is doubtful, because although normal black sesame seeds are also black, there will be different shades. Real black sesame seeds are usually mixed with white sesame seeds, yellow sesame seeds or even yellow sesame seeds shells that have not been removed, while dyed black sesame seeds look like they have no impurities.
2. Be careful of the sesame tip.
Unscented black sesame seeds, where black sesame seeds germinate, have a white (or yellow) the size of a needle tip, which is the hilum of sesame seeds. If sesame is dyed, there will be no such "spot".
Rub it with your hands to see if it will fade.
If it is dyed black sesame seeds, it will definitely fade when rubbed by hand. You can also wipe it with a wet tissue. What does not fade is really black sesame. On the contrary, it may be false.