Step 1: Introduction to the Munsell colour system.
The Munsell colour system is a colour model that describes colours based on three attributes: hue, value (lightness), and chroma (saturation). The system divides colours into categories for better identification and classification.
Step 2: Number of categories.
Based on the Munsell colour wheel, colours are divided into five categories:
1. Reds
2. Yellows
3. Greens
4. Blues
5. Purples
These categories help in organizing colours by their hue, allowing for easy identification and comparison.