Hello Mario!  Again, so sorry you had to wait forever to be approved as a member.  I hope my apology doesn't ring hollow to you.

I would be very interested in any discoveries you may have made regarding Goetz Meissen pieces.  I have had several suspicions that he produced in limited scope using porcelain. 
These suspicions were born from my discovery of a hidden drawer contained with Karl's personal medal cabinet that I purchased from the Goetz family in Munich.

This box contained many small treasures of wax seals, coins, plaster casts of medals likely from museums that were used as reference for his creative process.  There were also two designs in plaster that match Meissen issued pieces.  Florian Goetz, Karl's grandson, gifted me with another unissued piece that was half completed by Karl.

If you'd like, I can create a 'Porcelain' sub-forum for futher discussions.  Just let me know!  Henry

I have several bronze medals with various amounts of verdigris.  I've tried a few cleaning solutions to no avail.  Note I am a long-time coin collector and won't be doing any mechanical cleaning (brushing).

Anyone know of a chemical that can neutralize and maybe reduce the green effect?  I've tried researching online but found many references to chemicals no longer available.

John

Eberbach's Totentanz series, and this one in particular, continue to be very popular with collections.  A 11 Nov 2022 auction in Germany, one of these Verdun "bloodpump" medals sold for 1700 Euros (plus fee).

A very strong market.

John

Josef Gangl.  1914.  DEUTSCHLAND / DEUTSCHLAND / ÜBER — ALLES (Germany, Germany above all else).  Cast bronze, dark brown patina, gilded lettering and images on reverse, 101 mm, 285.96 g.  Vorzüglich (extremely fine). 

Obverse: On ground-line three naked men combat each other with two-handed broadswords; behind them fourth man semi-recumbent feebly raises broken sword with left hand, his severed right hand beside him; year-date 1 9 1 4 inscribed in exergue; artist's signature JOS GANGL inscribed vertically lower right; raised rim. 

Reverse: Three-line title inscription spanning central field; imperial crown center above inscription; four-pointed radiant star below; lettering and images gilded; raised rim.

Cf: Bernhart, Max.  1915.  Kriegsmedaillen bayerischer Künstler, pl. III, no. 22 (obverse illustrated).
Cf: Schulman.  1919.  La Guerre Européenne, Catalogue LXXV,  p. 27: no. 237.
Cf:Bernhart, Max.  1917.  Die Münchener Medaillenkunst der Gegenwart, pl. 12, no. 90 (obverse illustrated).
Cf: Frankenhuis, M.  (1919?).  Catalogue of Medals - Medalets and Plaques Relative to the World War 1914 - 1919, p. 80: no. 599 (mis-attributed to J. Bangl).

Lotte Benter.  1918.  Karl v Müller Fregattenkapitän (Karl v[on] Müller, Frigate Captain).  Cast iron lightly blackened, 106 mm, 336.21 g.  Vorzüglich (extremely fine).  Very rare!
 
Obverse: High-relief profile bust of subject to left in military collar and coat; title legend script (von Müller's signature?) deeply incised left edge; three-line incised artist's signature and year-date LOTTE / BENTER / 1918 lower right; later two-line incised engraving 1. Preis f. Jub. Staffel / 25 H. V. 1931 (see below). 

Reverse: Low-relief seascape with profile of SMS Emden at right steaming left; at left on horizon second ship steaming to left; overhead radiant sun; sharply raised rim.

Cf: Schulman, La Guerre Européenne, Catalogue LXXIII 1919, p. 72: no. 725 (bronze example).
Cf: Frankenhuis, M.  (1919?).  Catalogue of Medals - Medalets and Plaques Relative to the World War 1914 - 1919, p. 123: no. 958 (artist's name misspelled LOTTE BEUTER).

For another illustrated example sold at auction in 2015: https://www.dnw.co.uk/auction-archive/special-collections/lot.php?specialcollection_id=365&lot_uid=264211. 

In an appended note to the listing of this medal Schulman (1919, p. 72) explains: "Modelée d'après nature pendant le séjour à Noordwijk a/Zee (Hollande) du Capitaine de frégate v. Müller." (Modeled from life during the stay [i.e. internment] in Noordwijk aan Zee (Holland) of Captain v. Müller).

In 1931, this particular example was awarded as first prize of an event likely marking the jubilee celebration (Jubiläum), perhaps of an historical association (Historischer Verein), whence the engraving to right of the profile.  I have thus far not been able to trace a precise reference to this organization.

Karl von Müller (1873 - 1923) commanding the light cruiser SMS Emden, enjoyed a highly successful, albeit brief, career as a commerce raider in the Indian Ocean in the opening months of the First World War, acquiring a reputation for chivalry by his efforts to avoid harming civilians or merchant seamen on the ships taken or sunk.  The Emden was finally run aground and destroyed  by the light cruiser HMAS Sydney 8 November 1914 at the Battle of Cocos.  Müller and most of his crew were captured (though some evaded capture and returned to Germany).  The prisoners were detained at Malta, but Müller was later separated and taken to Britain.  Debilitated by malaria, he was transferred in a humanitarian prisoner exchange to neutral Holland for treatment, and was then repatriated to Germany shortly before the Armistice.  He was considered one of Germany's greatest naval heroes, and was commemorated on a number of medals, Benter's certainly being the most artistic.