You can eat it. The yellow color of mushrooms changes from natural white ash to yellow, which means that they are not fresh. At this time, the nutritional components of mushrooms are not as good as fresh mushrooms, but it will not affect eating, but there are some differences in taste.

Sometimes mushrooms will change color after being dried or baked, which will not affect eating.

Extended information:

How to preserve fresh mushrooms:

1. Select

mushrooms to be frozen, which must be fresh. They not only look fresh, but also smell fresh. If it smells strange, not full or moldy, just throw it away.

2. Cleaning

Don't wash the mushrooms that need to be frozen with water. You can wipe them with a clean cloth and cut off the mud with a small knife. If there are some rotten places or very hard parts on the mushrooms due to transportation extrusion, they must be cut off.

3. Preparation

All the ends of the mushrooms' rhizomes should be cut off. If the mushroom is 3 cm or larger, it should be cut into two halves or even four petals.

4. It doesn't really matter whether the container is in a freezer bag or a freezer box, as long as it can be filled. But if you freeze cooked mushrooms, make sure they have been cooled.

5. Freeze fresh mushrooms

As I said before, be sure to choose fresh mushrooms and wipe off the dirt with a clean cloth. Spread them out and put them on a plate for direct freezing. After freezing, put them in a container with a cover. In this case, they can be stored in the freezer for 3 months.

Reference: Baidu Encyclopedia-Mushroom Preservation Method

Reference: People's Daily Online-Be careful when eating mushrooms in summer and autumn.