‘Etching mill finish aluminum: 
Fig. 4: The second last image from a sequence where a rolled aluminum surface 
was etched in 85 % phosphoric acid at 55 °C for 15 s at the time. The irregular 
white line at the image center shows the specimen drift during the experiment. 
Etching mill finish aluminum 
Kig. 5: The same topography file as in Fig. 4 but here centered laterally relative to 
the first image in the sequence, and displayed as an “angle plot” with relief effect. 
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