Colour Number: 5
Pigment Details: Cadmium Sulphoselenide / Pigment Orange 20 (PO20)
Cadmium Orange Professional Watercolour is prepared using a mixed crystal inorganic pigment, cadmium sulphoselenide (sulphide selenide). The pigment is a solid solution of cadmium selenide in cadmium sulphide; the ratio of which will influence the pigment’s hue as the more cadmium selenide the redder the pigment will be. The temperature of calcination will also affect the pigment’s hue and colour strength; the higher the temperature the redder the colour.
Although first discovered earlier, cadmium orange was first introduced to artists at the International Exhibition, London in 1862. Its composition, may have been quite different from its modern counterpart, possibly based on cadmium sulphide or cadmium selenide, as the cadmium orange based on a solid solution of cadmium sulphoselenide was not fully commercialised until 1910 with further process improvements made in 1919.
The pigment has excellent heat stability, a high degree of lightfastness and chemical resistance, making it ideal for use in A J Ludlow’s Professional watercolour range. It's a bright and clean yellow-shade orange. As with all cadmium pigments this colour is opaque in heavier layers.
Although containing cadmium, this metal’s bioavailabilty in the pigment used in our watercolour is very low and so the pigment is considered safe for use in our Professional watercolour range.
|Brand||A J Ludlow|