Few people are aware of the difference that their ink choices can make as far as print quality and price per copy, but printers actually perform better if loaded with superior HP Deskjet Ink cartridges. This HP series includes cartridges created especially for home printing needs, such as school papers, photos, and internet materials. The ink for hp deskjet printers also works perfectly for business documents of all types and creates clear, clean pages, without leaving smearing or blurring. The professional quality of hp inks makes them one of the top choices for offices around the country. Hp inks are developed through scientific analysis that considers all aspects of their compatibility with the printer. Having developed more than a hundred formulations of ink to work with their printers, Hewlett Packard has the experience to produce precision products in a variety of colors to meet the differing needs of each individual consumer. It may take over three years to develop a new ink line that will give the desired results for a specific printer, but Hp keeps a staff of over a hundred chemical engineers and scientists working to achieve printing perfection at all times. The goal is to make sure that each printer has an ink that is completely compatible with its functioning. To create a new ink formula for the desjet series may require over 50,000 hours of manpower, but the company is willing to invest in this research to maintain a glowing reputation in the industry. Quality is so important to hp that each new formula undergoes stringent testing. The ink must pass tests to ensure that it has not been contaminated with impurities of any type which might mar copy or block the printer heads. It is also subjected to at least fifty tests to check for problems such as fading, resistance to water, and the accuracy of colors. Because the ink is responsible for over seventy-two million color combinations, the chemistry behind the formulas must be perfect, and development of new lines can take years. The ink produced by researchers at HP must also be as cost effective for customers as possible so the page yield and reliability of the cartridges are important as well. Periodically, the company does reliability studies to update and prove these powerful claims so consumers can be sure that they are getting the most from their purchasing dollars.