No, it will spoil the taste.

The correct way to soak black fungus:

Soak in cold water (warm water can be used in winter). After 3 to 4 hours of soaking, the water slowly penetrates into the fungus, and the fungus returns to its translucent state. The fungus soaked in this way not only increases in quantity, but also has good quality. According to experts, cold water can be used to soak black fungus to 3.5 to 4.5 times its original volume; if warm water is used, it can only be soaked to 2.5 to 3.5 times. This method should also be used for soaking Tremella fuciformis.