Yangzhi Manna is a kind of dessert that is prone to spoilage if not stored properly. Here are some signs of Yangzhi Manna spoilage:

1. Taste change: freshly made Yangzhi Manna tastes sweet, if there is a change in the taste, bitter or other odors, then it may have spoiled.

2. Appearance changes: fresh Yangzhi Manna should be bright in color and high in translucency. If you find that the color of Yangzhi Manna is dull, or there are some milky lumps on the top, including some lumps on the top, Yangzhi Manna will have some milky lumps after it is spoiled, and you will find that there is some precipitation, you can not eat it at this time.

3. Change in texture: Fresh Yangzhi Manna should be in liquid form, if you find Yangzhi Manna has a sticky feeling or appears layered phenomenon, then it may have been spoiled.

4. Change in smell: Fresh Yangzhiman should have a fresh smell. If it has gone bad, then it may have an unpleasant odor or putrid smell.

In short, if any of the above changes occur in Yangzhi Manna, it is best not to consume it as it may have health implications. It is recommended to keep Yangzhi Manna at a low temperature and consume it within a short period of time.