The Epson 664 ink series primarily consists of black, cyan, magenta, and yellow ink bottles for Epson EcoTank printers. However, it seems there isn't a dedicated blue ink in the standard Epson 664 series.
If you specifically need blue ink, you might want to check if your printer supports the use of other ink series that include blue. Some Epson EcoTank printers support additional colors beyond the standard cyan, magenta, and yellow. You may find printers that use the Epson 672 ink series, which includes additional colors like light cyan and light magenta, which can help enhance blue tones in prints.
Always double-check your printer's compatibility and specifications to ensure you're using the correct ink for optimal performance and print quality. If you're unsure, referring to your printer's manual or contacting Epson customer support directly can provide you with the most accurate information.