toner

[toh-ner]
noun
1.
a person or thing that tones.
2.
a highly concentrated organic pigment containing little or no inert matter.
3.
a powder, either dry or dispersed in an organic liquid, used in xerography to produce the final image.
4.
Also called chemical toner. Photography, Movies. a chemical solution used to change the color of and, in some cases, help preserve black-and-white prints and motion-picture film by altering or replacing the silver image.
5.
a worker for a paint manufacturer who tests the color and quality of paint.
6.
a cosmetic preparation, usually a liquid, used to restore firmness to the skin.

Origin:
1885–90; tone + -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
toner (ˈtəʊnə)
 
n
1.  a person or thing that tones or produces tones, esp a concentrated pure organic pigment
2.  a cosmetic preparation that is applied to produce a required effect, such as one that softens or alters hair colour or one that reduces the oiliness of the skin
3.  photog a chemical solution that softens or alters the colour of the tones of a photographic image
4.  a powdered chemical used in photocopying machines and laser printers, which is transferred onto paper to form the printed image

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Use refillable toner cartridges for printers instead of single-use cartridges.
Old toner cartridges can be slipped into prepaid mailing envelopes and returned
  to the manufacturer for recycling.
When you must print, use soy-based ink toner cartridges and recycled-content
  paper.
Now of course, you can run one off much more cheaply-- even if toner is
  expensive.
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