Talk:Verdigris

Doctor Who Novel
Verdigris is also the name of a Doctor Who novel written by Paul Magrs. --Travlr23 23:13, 1 Apr 2005 (UTC)

patina
What's the difference between verdigris and patina? —The preceding unsigned comment was added by 209.218.206.2 (talk) 20:38, 20 February 2007 (UTC).
 * According to the disambiguation page, verdigris is a type of patina. — Tajik24 03:37, 20 July 2007 (UTC)
 * I think I am right in saying that verdigris is the green patina found on copper alloys. Other patina colours such as red, blue or black can also be achieved on copper alloys, and on other metals.Plantsurfer (talk) 17:37, 2 April 2008 (UTC)
 * Verdigris Cu(CH3COO)2·[Cu(OH)2]3·2H2O ) > Copper(II) acetate is formed with acid whereas patina is a mixture of alcaline copper compounds. The two are often mixed up and use isn't consistent. Verdigris is toxic. 76.97.245.5 (talk) 00:44, 8 December 2008 (UTC)

Piano
Verdigris can be found in some piano actions forming especially in the center pin-bushing cloth area. Its effects can be purely cosmetic forming a greenish waxy substance, or more severe, with the action becoming sticky causing friction in moving parts. Piano technicians can remedy this problem (sometimes only temporarily) by cleaning with and alcohol mixture or by using a centerpin lubricant. In extreme cases it may be necessary to re-pin the part after replacing the bushing cloth. —Preceding unsigned comment added by Emmery (talk • contribs) 17:06, 2 April 2008 (UTC)

Etymology
"... it was required by artists in Greece." what is meant by this? The etymology here does not seem well explained. — Preceding unsigned comment added by 128.220.159.20 (talk) 18:53, 17 April 2012 (UTC)

German Version
Greetings! "Grünspan" is the german equivalent of Verdigris, but the german article https://de.wikipedia.org/wiki/Gr%C3%BCnspan is a disambiguation to Kupfer-(II)-Acetat https://de.wikipedia.org/wiki/Kupfer%28II%29-acetat, which is itself linked to Copper Acetate https://en.wikipedia.org/wiki/Copper%28II%29_acetate - I think it would make sense to have the german article linked to the Verdigris article. 143.50.241.35 (talk) 16:58, 15 December 2015 (UTC)

Which English?
Assuming that the Statue of Liberty is mentioned here, we should use American English. However, I see uses of British English in the article. Which English do we use? PeterPrettyCool (talk) 18:46, 2 March 2021 (UTC)
 * The guideline that applies here is WP:ENGVAR, (along with WP:ALUM as this is a chemistry related article). Typically, whichever variant is predominantly used in the article is the one used throughout and going forward. Sometimes people will go with whichever variant was used first when the article was created. This article should be designated as British English, for both those reasons. There are some exceptions, such as "strong national ties to a topic" (eg: if the article is about the United States, then it should be in American English), but I don't believe that applies here, just because there is an image of the Statue of Liberty (imho). Hope this helps. - w o lf  05:49, 1 May 2022 (UTC)

Wiki Education assignment: A History of Color
— Assignment last updated by Colorresearcher (talk) 19:45, 26 January 2023 (UTC)

This article is fundamentally flawed
Obviously, the Statue of Liberty is covered in patina, which is a protective layer, not in verdigris (copper acetate) which is soluble, destroys copper and thus cannot be a protective layer.

https://kupferspuren.at/en/informations/why-copper/patina-or-verdigris/

"Patina

Is a grey-green surface layer on copper and copper alloys, which consists of basic carbonates and sulfates. This layer forms when in reaction with the carbon and sulfur dioxide contained in air. Patina protects copper against decomposition. In its salient green form the patina, dependent on rain quantity and water composition, appears after approximately 8 to 15 years on flat surfaces that are strongly exposed to rain.

Verdigris

is a mixture of basic green or blue copper acetates, which settles on copper or brass. It develops as a result to longer influence of weak acids with mostly organic compounds. Food remainders (fruit acid, acetic acid) as well as animal eliminations (urine acid) are included in the above-mentioned category.

Unfortunately these two terms are often confounded and that is why it is frequently said that poisonous verdigris might develop itself on copper garden-devices. In reality a protecting patina layer forms on the devices; this layer protects them and guarantees a long life span." Sergey Romanov (talk) 08:37, 13 July 2024 (UTC)


 * If you insist on calling any green patina verdigris, so be it, but then do not define it as copper acetate, in which the Statue of Liberty is obviously not covered. Sergey Romanov (talk) 08:42, 13 July 2024 (UTC)