BLOOD PRINT

At your touch, wet blood on a surface shifts and
reforms into a pattern of crimson blotches. This
blood print is unique to the particular creature to
whom the blood belongs, but you can determine the
creature’s kind (such as human, gnoll, deer, or fire
giant) by examining the general shape. A print can
be preserved by pressing a sheet of paper against it.

If this spell is cast twice, it is possible to match samples
of blood originating from the same creature by
comparing the prints.