Description
This is a description of the Cotman Water Colour Tube - Ultramarine 8ML. This tube contains a complex sodium alumino-silicate containing sulphur pigment and has a colour index name of PB29 and a colour index number of 77007. This pigment is rated as A(iii) for permanence and I for lightfastness. The transparency/opacity of this pigment is T. The granulating/staining of this pigment is G.
Colour number/code: 660
Series number: 1
Chemical Description: Complex sodium alumino-silicate containing sulphur
Colour index name: PB29
Colour index number: 77007
Permanence rating: A(iii)
ASTM Lightfastness Rating: I
Transparency/
Opacity: T
Granulating/Staining: G
The range of 40 colours are chosen according to mass tone (colour from tube), undertone (bias of colour when in a thin film), colour strength, relative opacity and the character of the pigment itself. The resultant colour spectrum ensures the largest number of colours can be mixed.
The Cotman Water Colour range has a more uniform consistency than the Artists' Water Colour range and this benefits beginners as there is less to learn about each individual pigment. The Cotman Water Colour range also relates to the Winsor & Newton Artists' Water Colour range, this enables artists to use colours from both ranges with minimal adjustment to their technique.
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