In inkjet printing puddling is an image defect that occurs when wet ink drops touch one another on the receiver surface. This causes images to appear blotchy or ‘puddled’, resulting in non-uniformity in solid fill areas. This problem typically occurs with high-speed printing devices. It is also called coalescence.

Puddling can be caused by using a type of coated paper that is not suited for the device and the inks.

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