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We take lightfastness very seriously at Derwent as it is vitally important to professional artists. Derwent have the latest testing technology which measures the lightfast levels of every pencil. The pigments used in Derwent products are tested for lightfastness and graded from 1-8 (8 being considered extremely lightfast). We use the Blue Wool Scale, which is a testing standard common with artists' materials manufacturers.

Blue wool ref 1 will fade very quickly, whereas blue wool ref 8 is considered extremely lightfast. Any result above Blue Wool 6 (ASTM II) is considered to be VERY GOOD and will not fade for over 100 years in gallery conditions. 

Blue Wool Scale         Rating

3, 4                               Fair, moderate

5, 6                               Good, very good

7,8                                Excellent

We constantly monitor, develop and retest our pencil range to improve on our lightfast ratings. 

Pencils

Artists pencils

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Charcoal Pencils

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Chromaflow Pencils

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Coloursoft Pencils

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Drawing Pencils

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Graphic Pencils

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Graphitint Pencils

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Inktense Pencils

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Lightfast Pencils

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Metallic Pencils

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Onyx Pencils

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Pastel Pencils

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Procolour Pencils

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Sketching Pencils

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Studio Pencils

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Tinted Charcoal Pencils

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Watercolour Pencils

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Watersoluble Graphitone

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Watersoluble Sketching

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Blocks and XL Blocks

Compressed Charcoal

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Inktense Blocks

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Natural Graphite

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Charcoal XL Blocks

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Graphite XL Blocks

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Graphitint XL Blocks

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Tinted Charcoal XL Blocks

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Inktense XL Blocks

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Pens

Line Maker

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Paint Pen

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Paints

Watercolour Paint Set

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Inktense Paint Sets

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Pastel Shades Paint Set

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Metallic Paint Set

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Graphitint Paint Set

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Tinted Charcoal Paint Set

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Shade and Tone Mixed Media Set

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Line and Wash Paint Set

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