The Newton Colour Disc, also known as Newton’s Color Wheel, is a laboratory instrument used to study the properties of light and color. It consists of a circular disc divided into several colored segments arranged in a specific sequence, usually red, orange, yellow, green, blue, indigo, and violet. The disc can be rotated rapidly using a handle, causing the colors to blend together, creating a visual effect known as color mixing.

The Newton Colour Disc is used to demonstrate the color theory, such as how primary colors can be combined to create secondary colors. It can also be used to study the properties of light and color, such as the relationships between wavelengths and colors, and how light interacts with various surfaces and materials. The Newton Colour Disc is named after Sir Isaac Newton, who was the first to demonstrate color mixing using a similar device in the 17th century.