On the down side, fluorescent inks are not colorfast and will fade in bright light and sunlight over time. They can also have a negative effect on dot gain and trapping, making the printing less sharp and less detailed. The foil, which may be clear or opaque, comes in a range of colors and is carried on a plastic sheet. Stamping separates the foil from the plastic and makes it adhere to the paper. Foil stamping can be combined with embossing or debossing as an added design element.
Folding stresses the paper fibers.
To create a smooth, straight fold, heavy papers like cover stocks and bristols need to be scored before they're folded. Multiple fold strength is important for paper used in books, maps, and pamphlets. It's far less important in one-fold greeting cards or envelopes, where fold cracking is the vital consideration. The drying heat of printing and finishing operations can negatively affect folding strength. With the correct imposition, the pages of a form will be in correct order after folding and trimming.