Red and Green are opposite of each other on the color wheel so they complement one another. Adding the white really sets off the red and green colors as shown below.

By beckorama

By uniquecozytreasures

By uniquecozytreasures
This handcrafted clutch features the three primary colors: Yellow, Blue and Red.

By MarianRuth
Here is an example of using triadic color harmony. The primary colors are Blue Green, Yellow Orange, and Red Violet. A little white is splashed in for contrast.

By crochetedbycharlene
Next week I will continue the series on color mixing featuring some our talented etsy artisians handcrafted work.
It's a rainy dreary cold day here in Iowa. There is some snow forecast for later this evening. These colorful items that my fellow etsy friends have created will certainly brighten any day.
Deb