Only white and black colour is used is called :

Question

Accepted Answer

Option 1, "Achromatic," is the correct answer for the question "Only white and black colour is used is called." Here's why:

1. **Explanation for Option 1 (Achromatic):**
   - The term "achromatic" is derived from the Greek words "a-" meaning "without" and "chroma" meaning "color." Therefore, achromatic literally means "without color."
   - In the context of color theory, achromatic colors are those that do not have hue. This includes black, white, and all the grays in between. These colors are considered neutral and are not part of the color spectrum.
   - When only black and white are used, the result is an achromatic scheme, as it lacks any chromatic (colored) elements.

2. **Explanation for why other options are incorrect:**

- **Option 2 (Monochromatic):**
     - Monochromatic refers to a color scheme that is derived from a single base hue and extended using its shades, tones, and tints. This involves variations in lightness and saturation of one color.
     - While monochromatic schemes can include black and white, they primarily focus on variations of a single color, which is not the case when only black and white are used.

- **Option 3 (Polychromatic):**
     - Polychromatic means involving multiple colors. It is the opposite of monochromatic and achromatic.
     - A polychromatic scheme would include a variety of colors, which is not applicable when only black and white are used.

- **Option 4 (Analogous):**
     - Analogous color schemes involve colors that are next to each other on the color wheel. These schemes typically include one dominant color, a secondary color, and a third color that is either a mix of the two or a complement.
     - Since analogous schemes require multiple hues, they do not apply to a scheme that uses only black and white.

In conclusion, the term "achromatic" accurately describes a color scheme that uses only black and white, as it involves no hues or colors, making Option 1 the correct choice.