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If you are meaning black and white or colour films there has to be no light what so ever. Paper printing black and white prints can be done under safelight conditions, usually a deep yellow/orange safelight. Colour printing should be in total darkness. ordinary black & white? yellow or red panchromatic black & white? no light color? no light
Safelights are used when printing. They're made to produce only light of a color the paper being used isn't sensitive to.
he was known for developing a printing press that used movable metal type
Color printing was invented in Yuan Dynasty China. The earliest color printing discovered so far is a two-color frontispiece to a Buddist scroll, dated 1346. Color prints were also used later in the Ming Dynasty.
White.
Four color printing will vary greatly in price depending on the quality and amount of ink used in the printing job as well as the cost of other materials, such as the type of paper used. Four color silkscreen printing uses a different type of material and method, but the costs will vary according to the same variables.
The situations that color bars are used for televisions and cameras. They are used to calibrate a piece of equipment for tasks such as printing and copying.
Four color printing, also known as CMYK printing, is a process used in color printing to reproduce a wide range of colors by mixing four base colors: cyan, magenta, yellow, and key (black). These four colors are layered in various combinations to create a full spectrum of colors in printed materials. It is a widely used method in the printing industry for producing color images.
A monochrome laser printer is used for printing in one color: black.
Red color light
The four colors used in process color printing are cyan, magenta, yellow and key (black) or CMYK.