Light is absorbed at the back of the eye by cells (cones) sensitive to red, blue and green wavelenghts and seem to be responsible for color vision in daylight. In dim light the 'rods' take over, which are more sensitive to blue-green light, and distinguish clearly between values of light and shade. This is why squinting helps you determine the value of a color.
First: what value (how light or dark )do you prefer?
Medium values - from breastplate
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