Reference

Color-changing paints, also known as chromatic paints, are used in various everyday items, leveraging different technologies to achieve their effects. Some examples of these technologies and their uses include:

1. Thermochromic Paints: These paints change color with temperature changes. A common use is in mood rings and thermal mugs that change color when filled with a hot liquid. Thermochromic pigments are often used in paints for items like battery charge indicators or temperature-sensitive labels.

2. Photochromic Paints: These paints change color in response to light exposure, commonly used in sunglasses that darken under sunlight and lighten indoors.

3. Hydrochromic Paints: These change color when they come into contact with water. They are sometimes used in umbrellas or clothing items that reveal designs when wet.

4. Automotive Applications: Color-changing paints (often referred to as chameleon paints) are popular in automotive industries, allowing cars to appear as different colors when viewed from different angles or lighting conditions.

5. Smart Materials: Designers are exploring the use of these paints in creating adaptive textiles that change color, as well as in energy-efficient architectural elements that respond to environmental changes.

Here are some images that might offer more visual context on the applications of color-changing paints:

For more details, you can visit this source about the different types and uses of color-changing paints: The Chameleon's Guide to Colour-Changing Paint.