The definition of impromptu is something done without advance thought or without a plan. When everyone gets together and decides to throw a party at the spur of the moment, this is an example of animpromptu party. impromptu. an impromptu speech, performance, etc. impromptu.
If you prefer lighter color combinations, then instead of these three, go in for pink, light blue and pale yellow color combinations. Contrasting Color Combinations. By bringing together colors in different color categories, many interesting color combinations can be made.
These three, red, blue, and yellow, are known as the primary colors. Now that we've described two different categories of colors (pigment and light-generated) and have a definition of primary colors, the answer to whether black and white are colors can be answered.