Color is a wave of a different length. Color is a sense. Different creatures perceive color differently. Probably every human sees things in a slightly different tone. So what is in black and white is color as well. You can imagine the red, when you see the flesh, and rose symbolises pink, church icon could remind you of gold. It is our brain and senses, it is how we mediate in the world, past experiences, symbols, cliches, memory that creates a sense of color, not the world itself. So if you say that this page is white, we say that this project is in color.
*Synesthesia is neurological condition and in certain forms of synesthesia perceiving letters and numbers or hearing musical sounds will lead to the unusual additional experiences of seeing colors.