Colour-blind, people who can't see colour, receptor, these are the colour cones in our eyes. We have one for red, one for green and one for blue, trichromatic, human vision is this as we have three different colour cones in our eyes, tetrachromatic, birds are this as they have four different colour receptors in their eyes., cone, another word for receptor. we have these in our eyes to see colour, retina, an area at the back of the eye, shade (of colour), a colour can have many different types with small differences. These are called __________, green with envy, very jealous, feel blue, feel sad, see red, get really angry, out of the blue, a surprise, white lie, a small lie that doesn't cause harm, Black sheep, somebody who does something wrong, usually in a family, Tickled pink, when something pleases somebody.

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