Pantone Envelopes allow you to match the colour across all of your stationery products like letterhead, different sizes of envelopes, invoice forms, notepads, etc. The standard recipe makes it much easier to repeat the same colour for items ordered at different times or reprints in the future.
The other major advantage of Pantone printing is that the recipe can be scaled up or down as needed. Therefore, it is recommended that all Pantone items be ordered together so that one large batch of ink can be mixed and used for everything, guaranteeing that all items will have the exact same colour, because they will be printed with the exact same ink.