No, it can't. As we all known, it's more convenient for people to wear contact lenses in daily life, and it becomes a kind of makeup based on several colored contact lenses, such as red, blue, purple. There are different types of contact lenses based on different usage period. And the contact lenses of Halloween act as a kind of decoration. Though you put it in case with condition, but it would be hard after a few days if you don't wear it. On the other side, the condition would erode the contact lenses. Additionally, the quality of this Halloween contact lenses wouldn't be that good based on the purpose. Hence, you had better not reuse it any more after the Halloween.