Ink has evolved significantly over thousands of years, from early cave paintings using carbon-based lamp black ink, to modern inkjet printer inks. Ancient Chinese and Egyptians first developed lamp black ink in around 2000 BC by burning tar and oil and mixing it with gum or glue. By the 8th century, inks began using chemical precipitation and iron salts mixed with tannic acid. Johannes Gutenberg further advanced ink technology in the 15th century by developing the first printing press and an oil-based ink that better adhered to metal. Modern inkjet printer inks employ sophisticated formulations that dry quickly, resist fading, spread evenly, and avoid clogging printer nozzles.