Coldset and heatset are web offset ink systems with different formulations and drying requirements. The right choice depends on the paper, print quality and production requirements of the job.
Coldset printing generally costs less. Less expensive paper and equipment can make it attractive to businesses looking for a lower-cost entry into printing. The original article also anticipated a shift in customer preferences towards higher-quality print and more expensive inks.
Coldset inks are widely associated with newspaper printing and highly absorbent substrates such as newsprint and uncoated writing paper. The source also mentions their characteristic smell. Complete drying can take several days, even though the ink sets sufficiently for handling much sooner.
A well-formulated coldset ink uses light vehicle components that penetrate the paper quickly after printing, even at high press speeds, helping the printed film set promptly.
Fast setting reduces set-off, where ink transfers to sheets or surfaces above or below the printed work. Good ink performance also helps keep paper-draw rollers clean and reduces the consumption of cleaning solvents for the press and those rollers.