Final answer:
Toners are applied to lightest degree of contributing pigment after decolorizing in laser printers by spraying a negatively charged dry black powder onto a drum and transferring it to a positively charged paper. The toner is then melted and permanently adhered to the paper using heated pressure rollers.
Step-by-step explanation:
The question is about the application of toners after the decolorizing process. In the context of laser printers, the toner is a dry black powder that is sprayed with a negative charge. This charge attracts the toner to the positive regions of a drum. The drum transfers the toner to a blank piece of paper, which has a greater positive charge than the drum, causing the toner to be pulled from the drum. Lastly, the paper and the electrostatically held toner are passed through heated pressure rollers that melt and permanently adhere the toner to the paper's fibers.