A patch of thin paper pasted onto the tympan or impression cylinder to increase the pressure on a specific area of the printing plate. This technique is part of the make-ready process, ensuring that low spots on the plate print clearly and evenly. It compensates for minute variations in type height.
Heard on the job
The halftone is printing too light on the left edge, so add a tissue overlay to bring it up.
Also heard as
- Patch