Add a small amount of black, then add more if needed.
How do you make (1.) lime green food coloring and (2.)hot pink food coloring?
chemicals
Actually, you need to go to a specialty shop. There is a food color paste which is stronger than the standard food colors sold in groceries. This paste is highly concentrated, much like the...
To make a silver coloring mix equal parts of Royal Blue and Coal Black.
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.