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Each Permoglaze colour has been classified using the ACC system - one of the most accurate and comprehensive colour codification systems available. Every conceivable shade and hue can be accurately defined and coded in a logical sequence. Colours are arranged by their three key characteristics: hue, saturation and lightness.

Hue - As the characteristic that gives colour its place in the spectrum, (with dark blue naturally running into red via indigo and violet) hue is best represented in the form of a colour circle, ACC divides the circle into 24 sectors, designated by a letter of the alphabet. Each sector is then further subdivided into 10 smaller sectors from 0-9 giving a refined choice of 240 hues.

Neutral colours - Neutral colours (greys) have no hue and so cannot be coded. They are assigned the combination ON.

Saturation - Saturation describes the degree of intensity or richness - the greater the colour content, the greater it's saturation. Less saturated colours appear "duller" and "greyer." ACC measures saturation on a scale from 00 to 99, the higher the number, the greater the saturation.

Lightness - Colours can vary from light to dark and ACC measures the degree of lightness of a colour, using a scale from 00 to 99. Black, the minimum amount of light, is coded 00, while white, the maximum, is 99.

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