DORIS  How to judge premium color toner |
| Factor | Performance |
| Color | Hue | color consistency |
| Saturate | vivid, clear |
| Bright | very shining |
| Blackness & Chroma | ideal value controlled around 1.48 |
| Bottom ash | ideal value controlled around 0.05-0.06, above 0.06, the printing will be not clear. |
| Defective rate | normal range between 5%-7%, beyond this range, this toner particles may become waste power, on the one hand, reduce printing pages, on the other, shorten the developer life time. |
| DPI | if low resolution, the printing quanlity will be not clear, bad appearance. |
| Fixing | fixing fastness standard above 90% |
| Ghosting | double image is affected by conductivity and print medium |
