Composition and Permanence Tables
Using the tables helps artists to choose colours based on how they will appear as well as how permanent the finished artwork will be and by understanding exactly what’s in your colour, you can be sure to create the highest quality painting.
Composition and Permanence Tables by range
|Artists' Oil Colour||Professional Acrylic Colour|
|Winton Oil Colour||Galeria Acrylic
|Artisan Water Mixable Oil Colour||Professional Water Colour
|Griffin Fast Drying Oil Colour||Cotman Water Colours
T/O - Transparency/Opacity
To measure lightfastness using this system, colours are reduced to a level of 40% reflectance by the addition of Titanium White, (except for water colour which relies on the white paper). This means the amount of light reflected from the colour swatch. The swatches are then tested in both sunlight and artificially accelerated conditions.
Where no ASTM rating is given for a Winsor & Newton colour, it is labeled as N/L meaning "Not Listed", this usually indicates that the pigment or the type of range has not yet been tested by the ASTM. It does not necessarily indicate a lack of lightfastness.
In these cases we recommend that you refer to the Winsor & Newton permanence rating, which evaluates colour on many aspects including lightfastness and is used to indicate a colour's ability to resist fading.
Bl - Bleeding