Green.
Red and green are contrasting colours, and green next to red stands out.
The contrasting color of yellow is not violet, nor indigo, But blue. Not sky-blue, or aqua, but deep blue as seen on the left.
Any colour which is not red, yellow or blue is not a primary colour. In terms of light colour, any colour which is not red, green or blue is not a primary colour.
One part red (a primary colour) plus one part orange (a secondary colour) will result in red- orange (a tertiary colour).
if you mix the primary colour red, withe the secondary colour orange, you will get the tertiary colour red-orange.
green
Red :D
Contrasting and complimentary colours are the same thing. Green is a secondary colour. You achieved a secondary colour by mixing two of the three primary colour. In this case green is the mixture of Yellow and Blue. The complimentary colour to a secondary colour is the primary colour not used to create it; in this case the complimentary (or contrasting) colour to green is red.
They are the opposites on a colour wheel.
Red and green are contrasting colours, and green next to red stands out.
I believe its because they are the most contrasting colors to the human eyes, but I don't really know
stripe
Absolutely, its a great contrasting look
RED!
The contrasting color of yellow is not violet, nor indigo, But blue. Not sky-blue, or aqua, but deep blue as seen on the left.
Red
Red is the colour for communism.