I bought poster board but it is not acid free. It tells you right on the board if it is but since there is no label stating that there is no acid means there is acid in it? I went to the elmers web site and it explained that if it were acid free it would say it and it doesn't. did I make sence? I asked at home depot and they said they don't carry it. I guess they could special order it. I shoulda asked.