Difference between revisions of "Gunari"

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== Description ==
 
== Description ==
  
A bright yellow, natural dyestuff obtained from the leaves of the Indian mahogany tree, ''Cedula toona'', native to the southern Asia. Gunari has been used to dye wool and silk a bright yellow color. The primary colorant in gunari is [http://cameo.mfa.org/materials/fullrecord.asp?name=crocetin crocetin]. Crocetin is a substantive dye that is also found in [http://cameo.mfa.org/materials/fullrecord.asp?name=saffron saffron].
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A bright yellow, natural dyestuff obtained from the leaves of the Indian mahogany tree, ''Cedula toona'', native to the southern Asia. Gunari has been used to dye wool and silk a bright yellow color. The primary colorant in gunari is [[crocetin]]. Crocetin is a substantive dye that is also found in [[saffron]].
  
 
== Synonyms and Related Terms ==
 
== Synonyms and Related Terms ==
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Natural Yellow 4
 
Natural Yellow 4
  
== Other Properties ==
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== Physical and Chemical Properties ==
  
 
Crocetin is soluble in water, ethanol, alkali solutions. Crocetin forms a blue solution in concentrated sulfuric acid.
 
Crocetin is soluble in water, ethanol, alkali solutions. Crocetin forms a blue solution in concentrated sulfuric acid.
  
== Additional Information ==
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==Resources and Citations==
 
 
J.Hofenk-de Graaf, ''Natural Dyestuffs: Origin, Chemical Constitution, Identification'', Central Research Laboratory for Objects of Art and Science, Amsterdam, September 1969.
 
 
 
== Authority ==
 
  
 
* Helmut Schweppe, Schweppe color collection index and information book
 
* Helmut Schweppe, Schweppe color collection index and information book

Latest revision as of 14:31, 27 August 2022

Description

A bright yellow, natural dyestuff obtained from the leaves of the Indian mahogany tree, Cedula toona, native to the southern Asia. Gunari has been used to dye wool and silk a bright yellow color. The primary colorant in gunari is Crocetin. Crocetin is a substantive dye that is also found in Saffron.

Synonyms and Related Terms

Natural Yellow 4

Physical and Chemical Properties

Crocetin is soluble in water, ethanol, alkali solutions. Crocetin forms a blue solution in concentrated sulfuric acid.

Resources and Citations

  • Helmut Schweppe, Schweppe color collection index and information book
  • Colour Index International online at www.colour-index.org
  • Judith Hofenk-de Graaff, Natural Dyestuffs: Origin, Chemical Constitution, Identification, Central Research Laboratory for Objects of Art and Science, Amsterdam, 1969