Red
You can use any number of options, but for a ton of color with almost no flavor, beets are your best bet. Use the juice from the canned kind, or make your own by either boiling or juicing the raw vegetable. Learn exactly how to make frosting colored by beets from Joy the Baker.
Alternately, you can also use any red fruit, like raspberries or pomegranate. Just know that these may change the flavor - which can be a great thing! Lemon cupcakes withreal raspberry-infused frosting just so happen to be a favorite around these parts. To procure your dye, pulverize the berries in a food processor or blender, then strain out the colored liquid using a mesh sieve or cheesecloth.
orange and yellow fruit color
You can't make red, it is a primary color
Brown
Red and blue make purple.
Red food colour is made from cochineal, which comes from a certain type of beatle.
Red is the cheapest color to make.
Brown may be produced by combining red and green food coloring. It would be wise to make a small test batch to determine the proportion of each color.
i just mixed aqua and red food coloring with icing and it came out a rusty redish brown color i don't know if that helps for what your trying to do
Red food coloring is heavier than blue. The reason for this is because it takes more compounds to make red food coloring. Red food coloring is too far from the normal color, so it is heavier.
red
Im going to say yellow and red.
What? Red is a primary color, you can not mix colors to make red. You can use red to make other colors.
Make your favorite chocolate cake/cupcake recipe and add red food coloring until you've reached the desired color.