Dum-dum bullets use in WW1

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Let us establish which parties in WW1 used dum-dum bullets in WW1. After extensive use by the Anglo versus the Boer in South Africa, this type of bullet was strictly banned by the Hague conventions.

https://en.wikipedia.org/wiki/Expanding_bullet:
>Expanding bullets are designed to expand on impact, sometimes as much as twice the diameter.[1] This will slow the bullet down and more of its kinetic energy will be transferred to the target, creating a larger wound channel.

>Expanding bullets were given the name Dum-dum, or dumdum, after an early British example produced in the Dum Dum Arsenal, near Calcutta, India by Captain Neville Bertie-Clay.[6][7] There were several expanding bullets produced by this arsenal for the .303 British cartridge, including soft point and hollow point designs. These were not the first expanding bullets, however; hollow point expanding bullets were commonly used for hunting thin skinned game in express rifles as early as the mid-1870s.[8] The use of the term "Dum-dum", applied to expanding bullets other than the early .303 designs, is considered slang by most ammunition and ballistics sources.[9][10] Manufacturers have many terms to describe the particular construction of the various types of expanding bullets, though most fall into the category of soft point or hollow point designs. The expansion itself is sometimes called mushrooming.

>Another early name was General Tweedie's "mushroom bullet", cited in the New York Times in 1892.[11]

Let us have a look at the accusations:
Germany of Belgians:
http://www.firstworldwar.com/atoz/dumdum.htm
Germany of France:
http://encyclopedia.1914-1918-online.net/article/expanding_bullets
Germany of Anglo:
picture, http://www.uni-stuttgart.de/hi/wgt/WW_ONE/Start/Bleed_White/Technology_and_Science/ww1_ger_08_05.html
Entente of AH:
http://encyclopedia.1914-1918-online.net/article/expanding_bullets
France of Germans:
https://forum.cartridgecollectors.org/t/german-forbbiden-bullets-1914/11186