DIMENSIONS OF COLOUR
The three dimensions of colour are Hue, Value and Chroma. They are the means of describing colour.
Hue refers to: "The specific or family name of a colour which distinguishes one colour segment from another.
A pure hue has full-strength colour." (Pure colour may be found in flowers such as red poppies and yellow daffodils.)
Value refers to: "The graded scale of lightness or darkness of a colour, measured in relation to a graded scale from black to white. It is the modification of a hue shown in tints, tones and shades by the addition of black, grey and white." (Roses often come in various tints, tones, and shades of the colour red, from pink to maroon.)
Chroma refers to: "The intensity of colour. The range extends from extreme dilution to full strength saturation." (In other words some colours appear to contain a lot of the hue/colour such as in the first glass in the photograph, right down to a diluted version of the same colour in the last glass.)