Sophora seeds are normally soaked with rice, exposed to air for about 3 hours, this time it starts to change color. This is because acacia seeds will turn yellow when exposed to alkali, and will tend to oxidize and turn black when exposed to air.

Improvement, acacia seeds do not soak, put together when beating rice milk, need to filter, otherwise ___ slag. Can be improved, with the bottle alone soak acacia seeds, need to be low temperature and avoid light, hit the rice syrup and then mix, there is no slag.