Unknown Printer

Experienced technical support provide their insights in answering this question :
My hp printer is not printing blue

How to Identify and Fix Common Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced technical support :

Run a nozzle check to see if any of the print head nozzles are clogged. Then clean the print head, if necessary. The ink cartridges may be old or low on ink, and you may need to replace them. Your printed colors can never exactly match your on-screen colors.
Clean the printheads: Sometimes the issue why you are unable to print in color is because our printheads are clogged with ink. Clean the printheads and then print a document to check if color printing works. Some printers also have in-built programs that can clean themselves so remember to check for that.
Horizontal smearing shows that the ink tank`s bottom is clogged with fibers. If you discover a problem like this, remove the cartridges and begin cleaning them. Your ink cartridges may have dried out or the print heads may have become clogged with ink residue if they are older than a year.
Printer inks are of the colours cyan (light blue), magenta (purplish red) and yellow. Blue is printed by putting cyan and magenta in the same pixel. The only exception here are some (rare) printers that let you print black-only documents when one or more of the colour inks are empty.
All colors will work. However, avoid colors other than black or blue, as copying can wash out lighter ink colors.
When color ink is expended and black ink still remains, you can continue printing for a short time using only black ink. However, you should replace the expended ink cartridge(s) as soon as possible.
Inkjet printers work via subtractive color mixing. As different colors of ink are combined, each ink absorbs (subtracts) its characteristic colors and amounts of light. The light that is then reflected back to our eyes is what we see as different colors.
Color printing uses yellow, magenta, and cyan inks to produce various colors by subtractive mixing to give red, blue, and green. (Each color ink should be thought of as transmitting two of the additive primaries, which is the same as absorbing one of the additive primaries.)
The way colours are displayed on a computer monitor is by emitting light through combinations of red, green and blue LEDs (RGB). However, in digital print (eg. a desktop printer or commercial digital press) we generally see colours through light passing through dots of cyan, magenta, yellow and black ink (CMYK).
The printhead could be clogged, and you might need to clean the printhead several times to restore print quality. Use an automated tool from the printer control panel to clean the printhead. CAUTION: Never turn off the printer when ink cartridges are missing.
Replace low, empty or faulty ink cartridges on your printer. Print a test page from your printer and check if the cyan colour is printing from your printer. Try cleaning the printheads with ethanol and check if it helps.
Printing in black and white is possible without color ink, but only on select printers. Switching to a grayscale mode in printer preferences is easy to print without color ink. Buying a black-and-white-only printer is more cost-effective if you print mostly in black and white.
Your blue came out purple because of the divide between RGB and CMYK color gamuts. In simplest terms, the colors available in the RGB color gamut (what you can see on your screen) are much greater than the colors available in the CMYK gamut (what can be printed).
In conclusion, when it comes to signing legal documents, it is important to choose the right color ink. It is recommended that you use either black or blue ink for legal documents as these colors are the most accepted and will ensure your document remains valid.
Most scanners will detect the light blue lines. However, shifting to greyscale and increasing the contrast and brightness of the scanned image causes the blue to disappear.
Even when you are printing black text only, a small amount of color ink is used to keep the print head charged. The print head needs to be kept charged to prevent air bubbles from entering. Air bubbles can damage the print head.
The CMYK color model is based on the CMY color model, which omits the black ink. However, the imperfect black generated by mixing commercially practical cyan, magenta, and yellow inks is unsatisfactory, so four-color printing uses black ink in addition to the subtractive primaries.
Laser printers use toner powder instead of dye or pigment-based ink. Laser printers produce electrostatically charged dots on a light-sensitive drum which attracts toner powder. The toner is transferred to the paper and fixed by a heating process. Laser printers deliver crisp black and white and brilliant color prints.
Dark blue: Like black ink, dark blue tattoo colors are suitable for dark skin. They have long-wearing pigments and can also last for up to 10 years. Red, orange, yellow, and purple: These tattoo colors fade faster on light skin and are more crucial to working with sensitive and freckled skin.
Go With Blue Ink for Financial Paperwork and Signatures

Financial paperwork (e.g., credit card applications) and some other types of legal documents (such as those requiring a signature) usually require using a blue ink pen.

Conclusion: CMYK Produces Superior Color in Printing

Ink on paper must use the CMYK color space to achieve the optimum results by creating an unlimited number and shades of color. CMYK will produce full, dark, rich and vibrant colors to bring your project on paper to life!

Simply put, CMYK is the color mode intended for printing with ink, such as business card designs. RGB is the color mode intended for screen displays. The more color added in CMYK mode, the darker the result. The more color added to RGB, the lighter the result.
They do this using a driver or specialized software that has been designed to convert the file into a language that the printer can understand. The image or text is then recreated on the page using a series of minuscule dots.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

My 2550n Color LaserJet does not want to print in color
ANSWER : That model had issues with the carousel solenoid sticking. That might explain why it works after you let it sit for 10 minutes. The solenoid gets hotter with use which causes the deteriorated foam on it to become sticky and hold down the release plate instead of letting it go. This allows the carousel to spin when it is supposed to stop for each color. The solenoid is located on the right side of the printer. If you open the lid, it is just behind the opening at the top right. You need to remove the top of the printer and scrape off the goo on top of the solenoid body. I put a piece of thin sticky backed felt to replace it. Other people use electrical tape.

Read Full Q/A … :
Unknown Printer

HP Color Laserjet 3800 problem when printing color
ANSWER : Do a cold reset

Read Full Q/A … :
Unknown Printer

EPSON How to print in black when color ink is out?
ANSWER : Yup. Epson can suck my fat hairy toes. Spent a S#!$ load on a new black ink cartridge for it to still not work.

Read Full Q/A … :
Unknown Printer

color is not printing true
ANSWER : I changed all toners and drum and it is still doing it.

Read Full Q/A … :
Unknown Printer

Need help for Epson Stylus color 3000 print head?
ANSWER : I need help changing the print head in my Epson 3000 – I have 2 printers – one will not stay in alignment and the other black ink is plugged and I have soaked it and cannot get it to budge.

Read Full Q/A … :
Unknown Printer

Not Printing Blue color
ANSWER : My hp printer is not printing blue

Read Full Q/A … :
Unknown Printer

blue line on printing
ANSWER : Replace the cyan toner cartridge.

Read Full Q/A … :
Unknown Printer

Printing Problems
ANSWER : http://www.fixyourownprinter.com/posts/34513

Read Full Q/A … :
Unknown Printer