Tropaolin

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Tropaeolin is the common name for some azo dyes from the application group of acid dyes , which are used as indicators . The name is derived from the botanical name Tropaeolum for the nasturtium .

Examples of tropaolin dyes

designation CI name structure CAS no. Indicator properties Other uses
Tropäolin O
(resorcinol yellow )		 Acid Orange 6
Food Yellow 8		 CI Acid Orange 6 547-57-9 pH 11.1-12.7 yellow / brown
Tropäolin OO
(Orange IV)		 Acid Orange 5 CI Acid Orange 5 554-73-4 pH 1.2-3.2 violet red / yellow Dye for wool
Tropäolin OOO1
(Orange I)		 Acid Orange 20 CI Acid Orange 20 523-44-4 pH 7.6-8.9 yellow / pink
Tropäolin OOO2
(Orange II)		 Acid Orange 7 CI Acid Orange 7 633-96-5 pH 7.4-8.6 amber / orange Dye for wool and silk
Tropäolin D
(methyl orange)		 Acid Orange 52 CI Acid Orange 52 547-58-0 pH 3.1-4.4 red / yellow-orange Textile dye (USA)
Tropäolin G
(metanil yellow)		 Acid Orange 36 CI Acid Orange 36 587-98-4 pH 1.2-2.3 red-violet / yellow
Tropäolin RNP
(resorcinol brown )		 Acid Orange 24 CI Acid Orange 24 1320-07-6 - Coloring cosmetics

Individual evidence

  1. ↑ Tropaeolin . In: Jürgen Falbe, Manfred Regitz (Hrsg.): RÖMPP Lexikon Chemie . 6: TZ. Georg Thieme Verlag, Stuttgart, New York 1999, ISBN 3-13-735110-3 , pp. 4683 ( limited preview in Google Book search).