The warm seal is a method of transferring a metallized or pigmented layer of a special foil (hot stamping foil) on the printed material by heat and pressure. The foil can be golden, silvery, hologram, as well as in various metallic or fluorescent colors. Applying additional effects using the hot stamping method gives a wide choice of options for unique in appearance and difficult in complexity designs. There are two ways (rotary and flat) for hot stamping, as each of them uses different tools for this.

Rotary hot stamping. Through this method (technology) of hot stamping, especially in cases where the system uses fluid to reach the desired operating temperature and solid bronze 3D machined cylinders, high-end images are achieved. The disadvantage of this technology for applying warm is the high cost of making the tool (the bronze cylinder).

Flat heat press.This method also uses flat plates to apply the image, and the desired operating temperature is achieved electrically. Magnesium plates are most often treated by acid, as this limits to some extent the achievement of very fine elements and lines in the images (under 0,25 pt are considered critical) A significant advantage of this method is the very low cost of making the tool. If the above disadvantage is unacceptable to the customer, it is used as a printing element (tool) two-component metal plates, processed by 3D technology. Logically, these plates are more expensive than magnesium than 3 to 5 times.