There are certain shades of yellow, where white has been largely used in the mixture, which are capable of greenish reflections.

This is where the white is of so pure a quality as to suggest blue, and consequently under the influence of yellow to suggest green.

We often find yellow dyes in silks the shadows of which are positive fawn colour or even green, instead of orange as we might expect; still, even with modifications, yellow should properly be reserved for sunless rooms, where it acts the part almost of the blessed sun itself in giving cheerfulness and light.

Going from a sun-lighted atmosphere, or out of actual sunlight into a yellow room, one would miss the sense of shelter which is so grateful to eyes and senses a little dazzled by the brilliance of out-of-door lights; whereas a room darkened or shaded by a piazza, or somewhat chilled by a northern exposure and want of sun, would be warmed and comforted by tints of gold-coloured yellow.
Interiors with a southern exposure should be treated with cool, light colours, blues in various shades, water-greens, and silvery tones which will contrast with the positive yellow of sunlight.
It is by no means a merely arbitrary rule.

Colours are actually warm or cold in temperature, as well as in effect upon the eye or the imagination, in fact the words cover a long-tested fact.