yes, hamburger is not naturally red at all, instead its a dye that is added to make the meat look more appetizing to consumers. It is actually brown. To make sure it isn't spoiled, check the expiration date and smell it, if it smells foul throw it out.
Assuming you mean a cooked hamburger, try mixing a bit of black clay with white clay, making a grayish color. That is the closest you can get to the "real thing" since cooked hamburgers aren't brown, nor are they pink like raw hamburger is.
You use red.
Charcoal
red
Red and white together will make pink. If you use more white it will be lighter. If you use more red it will be darker.
The Blood Inside.
What? Red is a primary color, you can not mix colors to make red. You can use red to make other colors.
red
red
light red?
Red, definitiely Red
Some things are red and he paints them red.