Black No. 42 Return Program Ink Cartridge for Lexmark X4850,X4875,X4950,X4975,X6750,X7550,X7675,X7675,X9575 Printers. Lexmark Return Program helps to protect the environment. Produce exceptional prints with unique formulation of pigment based evercolour2 ink. Increased resistance against highlighter pen smudging. Water-resistant ink for optimal protection. Print business quality documents with sharp black text.