Difference between revisions of "Unki"
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== Description == | == Description == | ||
| − | A bright yellow natural dyestuff obtained from the fruit of the ''Gardinia florida'' that is native to the East Indies (Hofenk-de Graaf 1969). Unki has been used to dye silk a bright yellow color. The primary colorant in unki is [ | + | A bright yellow natural dyestuff obtained from the fruit of the ''Gardinia florida'' that is native to the East Indies (Hofenk-de Graaf 1969). Unki has been used to dye silk a bright yellow color. The primary colorant in unki is [[crocetin|crocetin]]. Crocetin is a substantive dye that is also found in [[saffron|saffron]]. |
== Other Properties == | == Other Properties == | ||
Revision as of 13:01, 10 May 2016
Description
A bright yellow natural dyestuff obtained from the fruit of the Gardinia florida that is native to the East Indies (Hofenk-de Graaf 1969). Unki has been used to dye silk a bright yellow color. The primary colorant in unki is Crocetin. Crocetin is a substantive dye that is also found in Saffron.
Other Properties
Crocetin is soluble in water, ethanol, alkali solutions. Crocetin forms a blue solution in concentrated sulfuric acid.
Additional Information
J.Hofenk-de Graaf, Natural Dyestuffs: Origin, Chemical Constitution, Identification, Central Research Laboratory for Objects of Art and Science, Amsterdam, September 1969.