| Show how to make spirit photographs print from ordinary negatives in the usual manner on printing out paper then fix alx the prints in a solution of one ounce of soda and eight ounces of water and wash them thoroughly while still wet immerse them in a saturated solution of ot of mercury until the image disappears then wash thoroughly be very careful as is ia very poisonous soak some clean blotting paper per in the of soda eoda solution and allow it to dry to cause the spirit photograph to appear cut a piece of blotting paper tho the same size is as the prepared print and moisten it then hold the apparently blank piece of paper in contact with it the photograph ill come out gradually clear and plain and it if washed thoroughly will be permanent popular science monthly |