Smoke taint – Flash has proven to greatly reduce smoke taint by capturing the guaiacol/4Methylguaiacol in the flash water removed through steam.  The guaiacol levels in the flashed juice do not recur over time.   Early Rains, mildew, mold – The bacteria, yeasts, and proteins caused by early rain will be denatured or removed from the must eliminating mold and rot flavors and further spoilage.  Bird Damage – Acetobacter or volatile acidity will be killed in the heating process.