duo-tone

duotone

[doo-uh-tohn, dyoo-]
adjective
1.
of two tones or colors.
noun
2.
a picture in two tones or colors.
3.
Printing.
a.
a method of printing an illustration either in a dark and a tinted shade of the same color or in two different colors from two plates of a monochrome original made from negatives at different screen angles.
b.
an illustration printed by this method.

Origin:
1905–10; duo- + tone

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Collins
World English Dictionary
duotone (ˈdjuːəˌtəʊn)
 
n
1.  a process for producing halftone illustrations using two shades of a single colour or black and a colour
2.  a picture produced by this process

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