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Which of the following is a natural dye ?

Answer» <html><body><p> Alizarin</p><br/><br/><p>Alizarin or 1,2-dihydroxyanthraquinone (also known as Mordant Red 11 and Turkey Red is an organic compound with formula C<sub>14</sub> H<sub>8</sub> O<sub>4</sub> that has been used throughout <a href="https://interviewquestions.tuteehub.com/tag/history-873" style="font-weight:bold;" target="_blank" title="Click to know more about HISTORY">HISTORY</a> as a prominent red <a href="https://interviewquestions.tuteehub.com/tag/dye-961060" style="font-weight:bold;" target="_blank" title="Click to know more about DYE">DYE</a>, principally for dyeing textile fabrics. Historically it was derived from the roots of plants of the madder genus. In 1869, it became the first natural pigment to be duplicated synthetically.Alizarin is the main ingredient for the <a href="https://interviewquestions.tuteehub.com/tag/manufacture-1086315" style="font-weight:bold;" target="_blank" title="Click to know more about MANUFACTURE">MANUFACTURE</a> of the madder lake pigments known to painters as Rose madder and Alizarin crimson. Alizarin in the most common usage of the term has a deep red colour, but the term is also part of the name for several <a href="https://interviewquestions.tuteehub.com/tag/relatedbrbr-2983848" style="font-weight:bold;" target="_blank" title="Click to know more about RELATED">RELATED</a> non-red dyes, such as Alizarine Cyanine Green and Alizarine Brilliant <a href="https://interviewquestions.tuteehub.com/tag/blue-899773" style="font-weight:bold;" target="_blank" title="Click to know more about BLUE">BLUE</a>.</p></body></html>


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