![]() What the lists reveal is whether another colour, regardless of manufacturer, contains the same P number as the one you don’t have. The list or Colour Index is jointly maintained and published by the Society of Dyers & Colourists (SDC) and the American Association of Textile Chemists & Colourists (AATCC) and effectively provides a world-wide standard in paint pigments. So for example, the P number for Cadmium Red is PR108 (P for pigment, R for red) while for Ultramarine Blue it's PB 29. ![]() It's a system that has been around since 1924 when it was recognised that there was a need for a consistent and dependable means of categorising pigments for use in the paint and dyeing industries.Įach pigment is given a unique number, sub-divided for clarity by the addition of another letter to denote a colour. The P (or pigment) number is found on the tubes of all decent quality paints. Side note: bear with me for this section - it sounds all a bit complicated at first but it leads to a very simple and practical conclusion. So is there anything you can do to make things a little more predictable? Actually, there is light at the end of the tunnel. But you can see that by substituting even the same colour from one company to another, you’re likely to get a different outcome. It all comes down to personal choice and what you want to use it for.
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