because people eat with there eyes and it makes it look more yummy!
Add colours.
Actually you shouldn't add water at all apparently. The best way to liquefy the powdered colours is to use gin or vodka, the alchohol will evaporate as the icing sets.
add white to red
No, unless you add a chameleon.
They are different colours.
Two colours are complementary if lights of those colours add to make pure white light. Complementary colours are not the same as complementary pigments (or paints).
natural has no added chemicals, colours etc.. artificial has, like sweetners, salts, colours etc..
food colouring
Food coloring
Indian food, Chinese & everything concerning chicken ..
They are colours that are produced using natural materials. Ochre is a natural earth pigment containing hydrated iron oxide. The colour can range from yellow to deep orange or brown.
Orange and Black. I would also add green and purple.