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Artists Oil Colour is unmatched for its purity, quality and reliability - a success which is reflected in its world-wide reputation amongst professional artists. It has 120 colours in the range, offering the widest spectrum of all the Winsor & Newton oil ranges.Covering Power not only comes from pigment strength, but also from the greater thickness of colour, which results from the stiff consistency associated with Artists Oil Colour. Covering power is particularly linked to the most opaque colours like Titanium White and the Cadmiums.Pigments vary in their transparency by nature. On the Winsor & Newton Artists Oil Colour chart and individual colour pages of this site, the transparent colours are marked with or T, the semi-transparent colours are marked or ST. The relatively semiopaque colours are marked with or SOand the opaque colours are marked with or O. Remember that the level of transparency of a colour is relative to other colours. Transparent colours are used for glazing and tinting, providing optical colour mixtures and depth of colour to the painting surface. Opaque colours cover well, give flat areas of colour and obscure/mask the underlayers of the painting. Artists Oil Colour is formulated to reflect the characteristics of each of the various pigments, ensuring that synthetic organics such as Phthalocyanines and Quinacridones [ie. "Winsor" or "Permanent colours"] deliver maximum transparency, whilst Cadmiums and Earth colours offer excellent opacity. The long drying time of Artists' Oil Colour is also a key feature of oil painting. The colour remains soft and wet for a few days and therefore allows corrections to be made from day to day. All colours will become touch dry in thin films in 2-12 days. The different reaction of each pigment when mixed with oil results in the different dry rates. Each colour is individually formulated to optimise its drying rate, which helps artists to avoid the problems of slow drying underlayers. Of the 120 colours in the range, 119 are now classed as 'permanent for artists' use' [AA or A ratings from Winsor & Newton] which aids in the longevity of paintings. Although Alizarin Crimson is only given a "B" rating ( moderately durable), it has been part of Artists' Oil Colour for over 130 years and is still considered a key colour by many contemporary artists.