Lithol Ruby BK
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| General | |||||||||||||||||||
| Surname | Lithol Ruby BK | ||||||||||||||||||
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| Molecular formula | C 18 H 12 CaN 2 O 6 S | ||||||||||||||||||
| Brief description |
dark red odorless powder |
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| properties | |||||||||||||||||||
| Molar mass | 430.34 g mol −1 | ||||||||||||||||||
| Physical state |
firmly |
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| Melting point |
> 200 ° C (decomposition) |
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| solubility |
poorly soluble in water |
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| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | |||||||||||||||||||
Lithol ruby BK , also called ruby pigment BK , is a light and heat-resistant red lacquered azo pigment . The compound was discovered by R. Gley and O. Siebert in 1903 and is listed in the Color Index as CI Pigment Red 57: 1. It is one of the most widely used organic pigments in terms of quantity.
properties
In terms of color, most variants produce a bluish red with high color strength . The light and weather resistance is only moderate, the resistance to organic solvents is good. The resistance to soaps , bases and acids is insufficient. The pigment is soluble in hot water (yellowish red shade) and insoluble in ethanol .
use
The main area of application is printing inks of all kinds, as the color corresponds to the magenta of various color scales. In the plastics sector, CI Pigment Red 57: 1 is used for articles with low requirements in terms of weather resistance. The pigment is used in PVC cable sheathing because it has good dielectric properties. In the paint sector, the pigment is only of secondary importance because it has a low light and weather resistance. However, it is occasionally used in industrial coatings.
It is added to food as a coloring agent and is used in some lip balm sticks . Litholrubin BK is approved as a food additive with the number E 180 for coloring the (edible) coating of cheese ( quantum satis ). As an additive, it can trigger pseudo- allergies. This particularly affects people who are allergic to salicylic acid and its derivatives .
Some special types are used for coloring special applications such as colored pencils .
Related links
Other salts of the azo base are also listed as pigments in the Color Index:
- Sodium salt ( lithol ruby B , "D&C Red No. 6", CI Pigment Red 57, CI 15850)
- Barium salt ("D&C Red No. 6 Barium Lake", CI Pigment Red 57: 2, CI 15850: 2)
Individual evidence
- ↑ Entry on PIGMENT RED 57: 1 in the CosIng database of the EU Commission, accessed on June 16, 2020.
- ↑ Entry to E 180: Litholrubine BK in the European database for food additives, accessed on June 16, 2020.
- ↑ a b c d e f Entry on Lithol Rubin BK in the GESTIS substance database of the IFA , accessed on April 23, 2018(JavaScript required) .
- ↑ a b Additives database .
- ↑ a b c The Society of Dyers and Chemists; Color index; Third edition; Second revision; Charlesworth & Co .; Huddersfield; 1982.
- ↑ a b c d W. Herbst, K. Hunger; Industrial organic pigments; 2nd Edition; Page 340ff Wiley-VCH; Weinheim; 1997; ISBN 3-527-28744-2 .
- ↑ Panel on Food Additives and Nutrient Sources Added to Food: Scientific Opinion on the re-evaluation of Litholrubine BK (E 180) as a food additive . In: EFSA Journal 2010, 8 (5), doi: 10.2903 / j.efsa.2010.1586 .
- ↑ External identifiers or database links for lithol rubin B : CAS number: 5858-81-1, EC number: 227-497-9, ECHA InfoCard: 100.024.998 , GESTIS substance database : 119138 , PubChem : 6093240 , ChemSpider : 4805074 , Wikidata : Q427230 .
- ↑ External identifiers of or database links for barium-3-hydroxy-4 - [(4-methyl-2-sulphonatophenyl) azo] -2-naphthoate : CAS number: 17852-98-1, EC number: 241 -806-4, ECHA- InfoCard: 100.037.991 , PubChem : 9577591 , ChemSpider : 20157921 , Wikidata : Q27281965 .