red
Black.
Its brighter so has blue colour
Use a light blue filter.
Black is considered a neutral color because it does not have a specific temperature association like hot or cold colors do.
Boron is typically black or brown in its elemental form at room temperature.
The color red is often associated with hot temperature because it is reminiscent of fire and heat. Red is also believed to stimulate energy and increase body temperature perception.
Black is considered a cool color with a low temperature, while white is a warm color with a high temperature. In terms of neutrality, black is often seen as more neutral and versatile, while white can sometimes appear more stark and less neutral.
Dark green if you only add a dash of black and if you increase it just gets darker until black overpowers it
Flat black, but of course, that's literally impossible to have. Basically, it's the flattest color of black you can have (flat as in not shiny) that normally would produce the most heat.
Some things, such as stars or metals, will change there color as they increase in temperature, indicating that they're radiating different energies. However, if you mean the "real" color of something, such as a plant or a shirt, then yes, there is a direct effect on temperature based on the color of the object.
Black surfaces absorb more solar energy than lighter colors because they absorb a wider range of wavelengths. This absorption of solar energy can increase the temperature of the surface, making it a good choice for solar panels to convert sunlight into electricity.
The color of soil affects temperature by influencing how much heat it absorbs from the sun. Dark-colored soils, like black or brown, absorb more heat and warm up faster than light-colored soils, like white or tan. This is why dark soils are often warmer than light soils.