Tertiary colors are colors that are a combination of primary and secondary colors. Primary colors are red, yellow and blue of course, secondary colors are orange, green and violet (purple). Colors on this palette are considered to be very calming in nature and are especially popular choices for children. You can find more information here: http://www.colourtherapyhealing.com/colour/tertiary_colours.php
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what are tertiary colors
a color, as brown, produced by mixing two secondary colors.