What is "tropaeolin"

Tropaeolin \Tro*p[ae]"o*lin\, n. (Chem.) A name given to any one of a series of orange-red dyestuffs produced artificially from certain complex sulphonic acid derivatives of azo and diazo hydrocarbons of the aromatic series; -- so called because of the general resemblance to the shades of nasturtium ( Trop[ae]olum).

n. Any of several orange dyes of very complex composition: ''tropaeolin O'' (acid orange 6, chrysoine resorcinol), ''tropaeolin OO'' (acid orange 5)(,) or ''tropaeolin OOO'' (acid orange 7).

Tropaeolin is a name given to several dyes:

• Tropaeolin O, also known as acid orange 6, also chrysoine resorcinol
• Tropaeolin OO, also known as acid orange 5
• Tropaeolin OOO, also known as acid orange 7