This Gulf standard specifies performance and marking for inks which are applied by nib-type pens or another application medium, e.g. roller ball pens, and which are intended for documents which may have a very long working and storage life. NOTE 1. The long-term durability of any document also depends on the composition of the paper on which it is written, storage conditions, etc. NOTE 2. Although security features can be introduced into writing inks, making the resulting script more difficult to alter, the producer of the original document may wish to consider the use of specially formulated background printing inks. These, used singly or in combination, will make alteration more difficult.