Talk:Rubia tinctorum

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This article says they are harvested the first year for dye production but the Wiki article on rose madder says that they are best after 18 (end of second growth season) to 28 months (well into third growth season) and http://www.shenet.se/vaxter/krapprot.html (in Swedish)says that they can be harvested after one or two years but that old plants contain more dye and that they should preferrably be at least three years and should be harvested in the autumn after the green parts are no longer green.

• Lopez, J.; Farrell-Beck, J. (1992). "What Colored the Transition from Madder to Alizarine?". Clothing and Textiles Research Journal. 10 (3): 36.
  doi:10.1177/0887302X9201000306
  .
• Parks, L. R. (1931). "The Chemistry of Turkey-Red Dyeing". Journal of Physical Chemistry. 35 (2): 488.
  doi:10.1021/j150320a008
  .
• Mellor, C. M.; Cardwell, D. S. L. (2009). "Dyes and Dyeing 1775–1860". The British Journal for the History of Science. 1 (03): 265.
  doi:10.1017/S0007087400001503
  .
• Ackerman, J. W. (1932). Journal of Physical Chemistry. 36 (2): 490.
  doi:10.1021/j150332a004. {{cite journal}}: Missing or empty |title= (help
  )
• Nakanishi, F; Nagasawa, Y; Kabaya, Y; Sekimoto, H; Shimomura, K (2005). "Characterization of lucidin formation in Rubia tinctorum L". Plant Physiology and Biochemistry. 43 (10–11): 921.
  PMID 16310368
  .
• Westendorf, Johannes; Poginsky, Barbara; Marquard, Hildegard; Groth, Gunnar; Marquardt, Hans (1988). "The genotoxicity of lucidin, a natural component of Rubia tinctorum L., and lucidinethylether, a component of ethanolic Rubia extracts". Cell Biology and Toxicology. 4 (2): 225.
  PMID 3069188
  .
• Ferreira, Ester S. B.; Hulme, Alison N.; McNab, Hamish; Quye, Anita (2004). "The natural constituents of historical textile dyes". Journal of the Chemical Society. 33 (6): 329.
  PMID 15280965
  .
• Derksen, G; Vanbeek, T (2002). "Rubia tinctorum L". 26: 629.
  doi:10.1016/S1572-5995(02)80016-3. {{cite journal}}: Cite journal requires |journal= (help
  )

With reference to the "History" section of the Article, to my knowledge a book "De re natura" by Pliny the Elder does not exist. On the contrary, a book by that author, entitled "Naturalis historia", does exist. By the way, in Latin, "De re natura" is not a correct expression; it should be "De re naturali". In addition, it exists a poem "De rerum natura", but its author is Lucretius. If I am wrong, please correct me. Otherwise, correct that "De re natura".Ekisbares (talk) 10:35, 7 December 2017 (UTC)[reply]

"madder, is a herbaceous perennial plant"

"The evergreen leaves are approximately 5–10 cm long and 2–3 cm broad"

I may be confused, but how does a herbaceous perennial have evergreen leaves? EuCl3 (talk) 22:12, 2 July 2023 (UTC)[reply]