5) Roughness : A 100x100mm sample is created and it measures with touches needle type surface roughness measuring instrument. Subsection : 0.8 mm , Measuring distance: 4 mm Stylus radius of curvature : 2 ㎛ " 6) Change of color : When the temprature of electric oven blast rise to 160℃,put in copper foil for 2min 30sec, take out,observe the change of color. " " 7) Cr: At the end of the roll, in middle position of the width, take10 cm X 10 cm sample to analysis. Dissolved by nitric acid surface by ICP."