Final answer:
The perception of a grey-blue color appearing violet is due to the way light interacts with objects and the absorptive characteristics of dyes. Pure blue objects reflect blue light while absorbing red light, giving them a blue appearance. Red and green dyes absorb blue and violet photons, while blue and violet dyes reflect those colors, contributing to the perception of colors.
Step-by-step explanation:
The perception of a grey-blue color appearing violet is due to the characteristics of light and the absorptive or reflective properties of objects.
When pure blue light falls on a white object, it reflects blue and appears blue. However, when pure red light falls on a white object, it absorbs all red light and appears black.
This explains why a pure blue object illuminated with pure red light would appear black since it absorbs all the red light.
The true color of the object is blue, which is independent of illumination.
Factors such as absorptive characteristics of various dyes and weakly bound molecules also contribute to the perception of colors.
Red and green dyes absorb blue and violet photons, which have higher energies and can break up their weakly bound molecules.
On the other hand, blue and violet dyes reflect those colors and do not absorb the more energetic photons, resulting in less molecular damage.
This can explain why blues and violets are the last colors to fade in many color posters.