Tropaeolin

{{for|plan chemical|glucotropaeolin}}

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.{{cite book |editor= Jürgen Falbe, Manfred Regitz|periodical=RÖMPP Lexikon Chemie|title=Tropäolin|volume=6: T-Z|publisher=Georg Thieme Verlag |location=Stuttgart, New York |page = 4683 |isbn=3-13-735110-3 |date=1999|language=German |url=https://books.google.com/books?id=Fo-ZAwAAQBAJ&pg=PA4683 }}

Examples for Tropaeolin dyes

class="wikitable sortable centered"

!Name

!C.I.-Name

!Structure

!Indicator properties

!Other uses

Tropaeolin O

(Resorcingelb)

Food Yellow 8

|File:Acid_Orange_6.svg

|547-57-9

|pH 11.1–12.7 yellow/brown

|

Tropaeolin OO

(Orange IV)

|File:Acid_Orange_5.svg

|554-73-4

|pH 1.2–3.2 violet-red/yellow

|Dye for wool

Tropaeolin OOO1

(Orange I)

|Acid Orange 20

|File:Acid_Orange_20.svg

|523-44-4

|pH 7.6–8.9 yellow/pink

|

Tropaeolin OOO2

(Orange II)

|File:Acid_Orange_7.svg

|633-96-5

|pH 7.4–8.6 amber/orange

|Dye for wool and silk

Tropaeolin D

(Methylorange)

|Acid Orange 52

|File:Acid_Orange_52.svg

|547-58-0

|pH 3.1–4.4 red

|Textile dye (USA)

Tropaeolin G

(Metanilgelb)

|Acid Yellow 36

|File:Acid_Yellow_36.svg

|587-98-4

|pH 1.2–2.3 yellow

|

Tropaeolin RNP

(Resorcinbraun)

|Acid Orange 24

|File:Acid_Orange_24.svg

|1320-07-6

|–

|Coloring cosmetics

References

Category:Azo dyes

Category:Benzenesulfonates

Category:Acid dyes

{{Chemistry index}}