You can add a few drops of food coloring to your icing, fondant or gum paste to create all kinds of unusual colors. If you are a novice it might be a good idea to invest in a good basic food coloring kit.
When mixing color always mix a small amount of color to experiment. Start with base color and then add very small amounts of secondary color. Be sure to mix enough color for the cakes to be decorated, as it is difficult to match an exact color.
Wilton is the only company that makes as many tints for icing as there are for oil paints. They have a comprehensive list of the colors, which come in a tube on their website at www.wilton.com. Once again when it comes to mixing colors for cake decorating Wilton is the only game in town.
Here is Wilton’s guide to using their icing colors to create unusual colors.
ANTIQUE GOLD: Add Leaf Green to Golden Yellow
AQUA: Mix Sky Blue and Leaf Green
CHARTREUSE: Add 9 parts Lemon Yellow to 1 part Leaf Green
CORAL: Add Creamy Peach and a touch of pink or orange and a touch of pink.
FLESH: Add just an extremely small touch of Copper to white icing. Ivory can also be used. Light pink with a small amount of brown will also create a flesh toned icing.
GRAY: Add just a touch of Black to white icing.
HUNTER GREEN: Mix Kelly Green and a touch of Black
JADE: Mix Leaf green, Royal Blue and a touch of Black
LAVENDER: Mix Pink and Violet
MARIGOLD: Mix Lemon Yellow and Orange
MAROON: Mix Burgundy and Red.
MAUVE: Mix Burgundy with very little Black.
MISTY GREEN: Mix Leaf Green, Royal Blue and a touch of Black
MOSS GREEN: Mix Violet and Lemon Yellow
MULBERRY: Mix Rose with a touch of Royal Blue.
NAVY BLUE: Mix Royal Blue and Black
PERIWINKLE: Mix Royal Blue and Violet
PLUM: Use violet with a touch of Christmas red.
RASPBERRY: Mix Pink and Red
RUST: Mix Orange, Red and Brown
TURQUOISE: Mix Sky Blue and Lemon Yellow
WARM GOLD: Use Golden Yellow with just a touch of brown
As you can see there are all kinds of ways to mix up icing colors, just as if you were a real artist with a real color palette. This is the Wilton guide to color mixing. If you use other brands of food coloring the effect may not be guaranteed.