Reference: Sample of Colour Chart..
5 Types of Watercolor Charts - Type 4: Color Mixing Chart
Reading Colour Wheel, NZ curriculum, Planning
10+ Color Chart Templates - Samples, Examples
Reflective color chart reference
Color Theory - Understanding the 7 fundamentals of color
Color Mixing Guide For Real Milk Paint
Color chart - Wikipedia
How to Make a Color Mixing Chart - Color Mixing Guide for Artists