What is the subtractive color in designing field?

the subtractive color in design field: CMY.

they start with light (white).

colore inks, paints or filters between the viewer and the light source or reflective surface substract from the light,, giving it color.

CMYK color model (process color, four color) is a subtractive color model, used in color printing, and is also used to describe the printing process itself. CMYK refers to the four inks used in some color printing: cyan, magenta, yellow, and key (black). 

Golden, sea green, violet or called special colors different than routine colors or CMYK colors

Available color systems are dependent on the medium with which a designer is working. When painting, an artist has a variety of paints to choose from, and mixed colors are achieved through the subtractive color method. When a designer is utilizing the computer to generate digital media, colors are achieved with the additive color method.