Barium lithol red
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MedKoo CAT#: 581241

CAS#: 1103-38-4

Description: Barium lithol red is also known as PR-258, is a transparent blue shade red pigment with low viscosity and excellent tinting strength. Lithol red is an azo pigment8 that comprises a family of sodium (PR 49), barium (PR 49:1), calcium (PR 49:2), and strontium (PR 49:3) salts of diazotised Tobias (2-naphthylamine-1-sulfonic) acid coupled with 2-naphthol. The metal dictates the shade of the pigment, which ranges from yellow to purplish blue.


Chemical Structure

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Barium lithol red
CAS# 1103-38-4

Theoretical Analysis

MedKoo Cat#: 581241
Name: Barium lithol red
CAS#: 1103-38-4
Chemical Formula: C40H26BaN4O8S2
Exact Mass: 0.00
Molecular Weight: 892.120
Elemental Analysis: C, 53.85; H, 2.94; Ba, 15.39; N, 6.28; O, 14.35; S, 7.19

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Synonym: Barium lithol red; PR-258; 1883 red; Barium lithol; HSDB 5523; Red No. 207; Light Red RB;

IUPAC/Chemical Name: 1-Naphthalenesulfonic acid, 2-((2-hydroxy-1-naphthalenyl)azo)-, barium salt (2:1)

InChi Key: LFZDEAVRTJKYAF-JTVZJQPRSA-L

InChi Code: InChI=1S/2C20H14N2O4S.Ba/c2*23-18-12-10-13-5-1-3-7-15(13)19(18)22-21-17-11-9-14-6-2-4-8-16(14)20(17)27(24,25)26;/h2*1-12,23H,(H,24,25,26);/q;;+2/p-2/b2*22-21+;

SMILES Code: O=S(C1=C2C=CC=CC2=CC=C1/N=N/C3=C4C=CC=CC4=CC=C3O)([O-])=O.O=S(C5=C6C=CC=CC6=CC=C5/N=N/C7=C8C=CC=CC8=CC=C7O)([O-])=O.[Ba+2]

Appearance: Solid powder

Purity: >98% (or refer to the Certificate of Analysis)

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.

Storage Condition: Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).

Solubility: Soluble in DMSO

Shelf Life: >2 years if stored properly

Drug Formulation: This drug may be formulated in DMSO

Stock Solution Storage: 0 - 4 C for short term (days to weeks), or -20 C for long term (months).

HS Tariff Code: 2934.99.9001

More Info:

Biological target:
In vitro activity:
In vivo activity:

Preparing Stock Solutions

The following data is based on the product molecular weight 892.12 Batch specific molecular weights may vary from batch to batch due to the degree of hydration, which will affect the solvent volumes required to prepare stock solutions.

Recalculate based on batch purity %
Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 1.15 mL 5.76 mL 11.51 mL
5 mM 0.23 mL 1.15 mL 2.3 mL
10 mM 0.12 mL 0.58 mL 1.15 mL
50 mM 0.02 mL 0.12 mL 0.23 mL
Formulation protocol:
In vitro protocol:
In vivo protocol:

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1: Kennedy AR, Stewart H, Eremin K, Stenger J. Lithol Red: a systematic structural study on salts of a sulfonated azo pigment. Chemistry. 2012 Mar 5;18(10):3064-9. doi: 10.1002/chem.201103027. Epub 2012 Feb 1. PubMed PMID: 22298463.

2: Inoue T, Kamikura M, Murakami N. [Dye standards of National Institute of Hygienic Sciences, "lithol rubine BCA standard", "lake red C standard" and "lake red CBA standard"]. Eisei Shikenjo Hokoku. 1968;86:136-9. Japanese. PubMed PMID: 5753657.

3: Chung KT, Fulk GE, Andrews AW. Mutagenicity testing of some commonly used dyes. Appl Environ Microbiol. 1981 Oct;42(4):641-8. PubMed PMID: 7039509; PubMed Central PMCID: PMC244076.

4: Kgzuka T, Tashiro M, Sano S, Fujimoto K, Nakamura Y, Hashimoto S, Nakaminami G. Pigmented contact dermatitis from azo dyes. I. Cross-sensitivity in humans. Contact Dermatitis. 1980 Aug;6(5):330-6. PubMed PMID: 7418389.

5: Chung KT. The significance of azo-reduction in the mutagenesis and carcinogenesis of azo dyes. Mutat Res. 1983 Apr;114(3):269-81. Review. PubMed PMID: 6339890.

6: Chung KT, Stevens SE Jr, Cerniglia CE. The reduction of azo dyes by the intestinal microflora. Crit Rev Microbiol. 1992;18(3):175-90. Review. PubMed PMID: 1554423.

7: Yang G, Lee HE, Lim KM, Choi YK, Kim KB, Lee BM, Lee JY. Potentiation of skin TSLP production by a cosmetic colorant leads to aggravation of dermatitis symptoms. Chem Biol Interact. 2018 Mar 25;284:41-47. doi: 10.1016/j.cbi.2018.02.020. Epub 2018 Feb 17. PubMed PMID: 29462589.