Information about log E paper ranges needs to be reliable
. Such information is best obtained by a test in the actual printing conditions, rather than relying on manufacturer's data which are only representative of a product. This information can be obtained by printing a negative step tablet in a standardized way with a controlled light source and at a know magnification if a enlarger is being used. A visual examination
of the print of the step tablet is usually sufficient to establish of the range of log E over which the paper responds."