Offset printing ink balance principle is that do not make plate dirty, to minimize the amount of the wetting liquid. During printing process, many dynamic changes are likely to lead to a broken of ink balance, offset operator needs to actively check stolen from prevention forum. Priority check should be the easiest to detect stolen:

1. The small anti-white text or line easy to be dirty, especially when the plate is no hierarchy.

2. The level version of the darkened part is easy to lay out.

3. The printed version of the bite edge due to wear relatively more serious, more easy to play dirty.

The above mentioned problems are mainly for visual assessment. Printing light color ground, the general visual assessments Lord; dark field print should better use densitometer auxiliary detectors.