Claims of being eco-friendly or other refillable toner cartridges are also prohibited.

• How to deal with the residual color laser toner inside the drum unit?
  Original color laser toners specified for dedicated consumables should not have this problem. It is strictly prohibited to use alternative color photocopying toners because the drum unit generates static electricity, which breaks down the substitute toner, making it adhere to the drum unit and preventing the replacement of its contents, rendering it unmanageable.
• Due to the prevalence of third-party color laser toner in the market, many claim to be environmentally friendly fillable toners. Apart from cost considerations, there should be no other benefits. Tested original toners indeed reduce the distribution of PM2.5 particulates in the air. In contrast, third-party toners are mostly substitutes for color copiers, which do not serve the purpose of being environmentally friendly for the machines or the environment. Prints made with third-party toners often exhibit a powdery appearance (false adhesion). While this does not significantly affect regular document usage, it poses substantial harm to drum unit users. Most people cannot distinguish toner types, so it might be advisable to consider using water-soluble inkjet printers with waterproof inkjet printing paper.

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