[article]
| Titre : |
A natural gem |
| Type de document : |
texte imprimé |
| Auteurs : |
David Sutton, Auteur ; James Garside, Auteur |
| Année de publication : |
2002 |
| Article en page(s) : |
p. 11-12 |
| Langues : |
Anglais (eng) |
| Catégories : |
Bleu (couleur)
Pigments à effets spéciaux
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The author describe how blue pigment specialist, Holliday Pigments, uses colour management technology to define, communicate and manage colour.
Ultramarine blue (UMB) pigments have been produced at the Holliday Pigments site in Hull since 1884 and, with its sister operation in France, it supplies over 50% by volume and 70% by value of all the UMB pigments used in the world. The only natural source of this material is lapis lazuli which is a gemstone formed metamorphosed limestone. Often contaminated with iron pyrites, it became known as blue gold. First mined in Afghanistan over 6000 years ago, it is believed to have been introduced to Europe in Marco Polo. The blue crystal, lazulite, is a valued pigment when ground to a fine powder and was used in oil paints by artists who appreciated the brightness and vibrancy of the colour. For the industrial use, lazulite is produced synthetically by a process developd in France at the start of the 19th century. Because UMB pigment counters yellowing, it originally gained popularity as a whitening aid in laundry and was even used as an additive to sugar. Now the pigments are used mainly in paints, inks, artist materials, cosmetics and plastics. It occupies a special position in the colour spectrum and by chemical alteration, is can also be modified to produce shades of violet and pink. |
| Note de contenu : |
- Blue chemistry
- Advantage in paint formulation
- Colour control
- A quality journey
- Widespread blues |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27891 |
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 192, N° 4459 (12/2002) . - p. 11-12
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