Tropaeolin

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Tropaeolin is the retained name for some azo dyes from the industrially applied group of acid dyes used as pH indicators. The name is derived from the botanical name Tropaeolum for nasturtiums.[1]

Examples for Tropaeolin dyes[edit]

Name C.I.-Name Structure CAS number Indicator properties Other uses
Tropaeolin O

(Resorcingelb)

Acid Orange 6

Food Yellow 8

C.I. Acid Orange 6 547-57-9 pH 11.1–12.7 yellow/brown
Tropaeolin OO

(Orange IV)

Acid Orange 5 C.I. Acid Orange 5 554-73-4 pH 1.2–3.2 violet-red/yellow Dye for wool
Tropaeolin OOO1

(Orange I)

Acid Orange 20 C.I. Acid Orange 20 523-44-4 pH 7.6–8.9 yellow/pink
Tropaeolin OOO2

(Orange II)

Acid Orange 7 C.I. Acid Orange 7 633-96-5 pH 7.4–8.6 amber/orange Dye for wool and silk
Tropaeolin D

(Methylorange)

Acid Orange 52 C.I. Acid Orange 52 547-58-0 pH 3.1–4.4 red Textile dye (USA)
Tropaeolin G

(Metanilgelb)

Acid Yellow 36 C.I. Acid Yellow 36 587-98-4 pH 1.2–2.3 yellow
Tropaeolin RNP

(Resorcinbraun)

Acid Orange 24 C.I. Acid Orange 24 1320-07-6 Coloring cosmetics

References[edit]

  1. ^ Jürgen Falbe, Manfred Regitz, ed. (1999). Tropäolin (in German). Vol. 6: T-Z. Stuttgart, New York: Georg Thieme Verlag. p. 4683. ISBN 3-13-735110-3. {{cite book}}: |periodical= ignored (help)