Why do we see yellow toner in non-yellow toner cartridges?

yellow toner in non-yellow toner cartridges

Prior to putting in the toner cartridge into your machine, some people may notice a coating of yellow or white toner powder showing on the developer roller of the Black, Cyan, Magenta and Yellow toner cartridges.

yellow toner powder thin coating

The skinny coating of yellow toner or white powder is a part of the manufacturing process and is utilised to all colour LaserJet cartridges (Black, Cyan, Magenta and Yellow) on the manufacturing unit.

HP OEM cartridges

As you can see from the original toner cartridge, the HP OEM cartridges will even have this coating.

Q:  Do all HP Original colour LaserJet cartridges have the coating of the yellow powder?
A:   Yes, the powder also appears on all HP original developer rollers, as shown on the image above.
 
Q:  What’s the purpose for the application of the yellow toner or white powder?
A:   The powder functions as a lubricant to the inside elements of the cartridge. It’s also used for testing functions to make sure the toner is of high quality.

Q:  How long will the yellow toner or white powder be present on the developer roller?
A:  It should disappear before the first few pages are printed. During the quick calibration if you set up your cartridge the powder will get eliminated.
 
Q:  Why specifically is the colour yellow or white used?
A:  As they blend in easily with the other colours of the toner.
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About aalim

aalim is the "Creative Guru" at Ink N Toner UK, and writes the intriguing blog articles you all love to read. When he is not writing about things related to printers, he is exploring his mind to find other wonderful things that you will be happy to read about.