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It depends on which blue and which brown you use. There are a wide variety. For example if you mix ulra marine blue and burnt umber you will get black. Adding blue to a reddish brown will make the brown darker, but also more violet. Using a yellowish brown and blue will give you more of a greenish brown.
You have to experiment with the colors on your pallet to see exactly which one you get.
The related link below will help you understand more about mixing colors to get the ones you want.
What else can I help you with?
What color does maroon and blue make?
brown
What color does purple and blue and green make?
turquoise
What does black and baby blue color make?
brown
What color does yellow and red and blue make?
The color that red, yellow, and blue make, is black. Although I read in a book that red, yellow, and blue makes brown. Though that is not true. If that wasn't the color you wanted, I would try doing gray, mixing the color with red. (That would turn out to maybe brown,) If it still isn't brown, Then you are out of luck. Sorry! :(
What color does a grayish blue and a brown make?
A Civil War re-enactment.More seriously, one such blue-gray blend is called periwinkle.Lavender
What color do you add to navy blue to make brown?
cheese
What color does red and blue and orange make?
purple or brown
What color do you get when you mix blue with brown?
When black and blue are mixed together they will make very dark blue. This is called a shade of blue. If you use mostly black you may not notice that there is blue in the color.
What color does red orange yellow green blue and purple make?
Brown
What make the color of the eye?
The color of your Iris which can be brown black green blue or grey.
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.
What color do you get when you mix red with blue with green?
Some shade of brown. Red & blue make purple, add green and you get brown.
