How Do Printing Inks Work?
Inks may be either opaque or transparent. Although there are many uses for both, the bulk of printing and all reproduction of colored pictorial material, such as art work or photography by process printing, require transparent inks. Such reproduction utilizes the three transparent subtractive secondary colors (plus black generally) to reproduce all the colors of the original.
Reproduction by process printing requires use of the subtractive secondary colors (and often black to deepen shadow areas or to increase contrast). The colors are yellow, magenta and cyan. When they are combined, you see several colors- but it is called a three color reproduction. (See Figure 2)
A colored transparent ink film modifies light by subtracting from the light source certain wave lengths and transmitting others. Just as the green bottle subtracts red and blue and transmits green as in Figure 4.
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