PTS This award from the Paper Technology Foundation (PTS) certifies that our ink cartridges have the document authenticity required by law for many applications (e.g. creating notarial documents). 100 years of lightfastness Brother ink cartridges are particularly suitable for printing documents that need to be archived over a longer period of time. If you use Brother BP-71 printing paper at the same time - which is optimally matched to the composition of the ink contained in the printer cartridge - we even guarantee lightfastness for a period of 100 years. 4 separate cartridges All Brother ink multifunction devices have separate ink cartridges for each color.Only the cartridge that has actually been used needs to be replaced. This means you protect the environment and your wallet. Blue Angel Tested devices certified according to RAL-UZ 171 are characterized by their energy-efficient and low-emission operation when using Brother ink cartridges. Brother considers the environmental impact at every stage of your ink cartridge's life cycle and reduces waste during disposal. All of our hardware and all of our ink cartridges are built to have as little impact on the environment as possible. Original ink cartridge from Brother LC-223BK - definitely worth it