File:Benzo Colours on Cotton Yarn, Part II - DPLA - 8193ee56c4a9f071ae5e4145d4a3348c (page 28).jpg

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Benzo Colours on Cotton Yarn, Part II   (Wikidata search (Cirrus search) Wikidata query (SPARQL)  Create new Wikidata item based on this file)
Creator
InfoField
Farbenfabriken vorm. Friedrich Bayer & Co
Title
Benzo Colours on Cotton Yarn, Part II
Description
Part II of a sample book from Farbenfabriken vorm. Friedrich Bayer & Co.—the first incarnation of the modern pharmaceutical company Bayer AG established to manufacture and sell synthetic dyestuffs—containing mounted dyed yarn and cotton thread samples. Benzo refers to benzene, indicating the chemistry of direct cotton color from coal-tar derivatives. The samples illustrate benzo colors after treatment with formaldehyde and metallic salts, coupled with parazole FB, and diazotized and developed. The text includes directions, dye concentrations and formulas, and information on color fastness.
Date 1921
date QS:P571,+1921-00-00T00:00:00Z/9
institution QS:P195,Q5090408
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Public domain
Public domain
This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
United States
United States
This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

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