Using the same procedure as above, a series of prints needs to be made covering at least the range of ink
film thicknesses specified in 5.4 and preferably beyond, for higher precision. However, for this test the black
substrate may be any gloss-coated paper, of reasonable opacity, which may have been pre-printed with an
area of black ink that has an L* value no greater than 6. Such material may be purchased from the Leneta
Corporation or IGT Testing Systems or produced by the user by printing the substrate with two or more
coatings of black ink, allowing sufficient time between printings for the ink to dry (4.2.2).