On august 7th, three days after the murder, neighbor alice Russell stated that she witnessed, along with emma borden, lizzie borden burning the dress she wore on the day of the murders of her parents.
"[alice russell] I went into the kitchen, and I saw Miss Lizzie at the other end of the stove; I saw Miss Emma at the sink. Miss Lizzie was at the stove, and she had a skirt in her hand, and her sister turned and said, "What are you going to do?" and Lizzie said, "I am going to burn this old thing up; it is covered with paint."" (Linder).
This was the same dress lizzie had worn on the day of the murder, before she changed after discovering the bodies of her parents. She had burned the dress to a crisp in the kitchen because it had "paint" all over it. Or did it really have blood on it? or on the inside of it?