How would a colour test be carried out?

A color test typically involves exposing a sample to specific wavelengths of light to observe its color response. This may include using a spectrophotometer to measure the intensity of light at different wavelengths, or applying color reagents to a sample and comparing the resulting color change to a standard color chart. The results are then analyzed to determine the composition or properties of the sample. Proper controls and calibration are essential for accurate interpretations.