Specks of dust on the clear areas of the positive as on the contact frame glass causes 

The coating plated over the surface of a gravure cylinder to have easy engravability

Whenever the web stops, the gravure cylinder must continue to rotate slowly in the ink pen and called as

The angular measurement where the surface of the gravure cylinder is free of ink prior to printing

The impression roller that automatically change its shape to conform to the amount of impression roller deflection

In -------------- printing problem, it appears as blotches and streaks in the solids and tones of an overprinted ink film on a press sheet.