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Brown or gray depending on if you are using true complementary colors or not. If you mix cadmium red (red-orange) with phthalo green (blue-green) in a ratio of 3 to 1, you will get a dark gray. If you look on the color wheel, you will see that red-orange and blue-green are directly opposite each other so they are true complementary colors.
If you use the same cadmium red and mix it with sap green (yellow-green) you get brown. The color wheel shows that they are on color away from being complementary, thus the brown instead of gray.
Adding white to either of these will give you varying shades of gray or light brown. There are two related links which may be helpful. The second is a video demonstration.
Alternative AnswerAll the above answers deal with pigments and paints. When dealing with light, the story is different. Red light added with green light in the right proportion makes yellow light.The area of your eye that detects color is called the "cone". Your cones are specialized to send the messages for "red", "blue" and "yellow" to your brain. The absence of red is green, just like the absence of white is black. Thus, under normal conditions, there's no way to combine red and green. However, there are very specific conditions that cause your retinas to receive both a "red" and a "green" signal and send both signals to your brain, resulting in "reddish green". Doing so is difficult, one has to flash red and green in quick succession before the person trying to see reddish green while trying to keep that person's head very still so not to disrupt the illusion.
When you blend red light and green light of equal luminance, they cancel out. Since most forms of light contain RGY, most people see yellow rather than white when this "cancel" happens. The reason why green and red paint turns brown is because you've overloaded the paint with pigments, it's absorbed so much over every color that it can't display yellow or white, but your eye is canceling out either the red or the green (as well as the blue or the yellow) because you can't normally see both at once.
Depends whether you mean pigments as in paint or colours of light.
Mixing red and green paint produces a sort of brown colour depending on the shade of the paints.
Red and green light produce yellow, which may seem strange, but true.
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How can you make the color green if something is red?
To make the color green, you can mix red with blue. By adding blue to something that is red, you can achieve a green hue since green is the complementary color of red. Adjusting the ratio of red to blue will determine the shade of green produced.
What color does green and red make when mixed together?
Green and red make the color brown when mixed together.
What color does red and green make when combined?
Red and green combined make the color yellow.
What color does dark green and red make?
Dark green and red make a brown or earthy color when mixed together.
What color does red and green together make?
Red and green together make brown.
What color does green and red mixed make?
Green and red make brown when mixed together.
What colour do you add to green to make red?
Red. You can't make a pimary color out of a secondary color.
What color do you mix green with to make orange?
To make orange, you mix red with yellow, not green. Green and red will make brown.
What secondary colours do Red Green Blue make?
Since green is a secondary color, mixing it with any color would make a tertiary color. But red and green are complimentary colors and therefore would make a brown-black color. So blue, green and red mixed together would make and ugly brown color that's tinted with blue.
How do you make the color brown from green?
To make the color brown from green, you can mix in a bit of red or orange. This will neutralize the green and create a brown hue. Start by adding small amounts of the red or orange color to the green until you achieve the desired shade of brown.
What color will you have if you mix green and red?
Mixing green and red will create the color yellow.
How does red and green make?
Red and green do not make a new color when combined. They are complementary colors, meaning they are opposite each other on the color wheel and create a high contrast when used together.
