Ink cartridge set in Brother brand quality for stunning colour printing.PTSThis award by the Papiertechnischen Stiftung (Paper Technology Specialists; PTS) certifies that our ink cartridges meet the standards of documentauthenticity that are legally stipulated for many purposes (for example creating notarial deeds). Lightfast for 100 yearsBrother ink cartridges are particularly well suited to printing documents which are to be archived for a longer period. If the Brother BP-71 printer paper â which is ideally tailored to the composition of the ink in the printer cartridge â is also used, we even guarantee a document will be lightfast for a period of 100 years. Blue AngelBrother ink cartridges have achieved Blue Angel certification in accordance with RAL-TO 122 and can therefore be viewed as particularly environmentally friendly and gentle on resources.