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Here are some sites and/or videos for more info.
https://www.warmuseum.ca/firstworldwar/history/battles-and-fighting/weapons-on-land/poison
https://www.dw.com/en/world-war-one-mustard-gas-canisters-still-scattered-throughout-flanders/a-18402117
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2376985/
https://www.nti.org/learn/biological/

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Below is a picture of some art work from WW1. This art piece depicts a child and a woman wearing Gas masks. This is from a art collection in philidelphia, that has  160 paintings from over 80 different artists. This includes propaganda, artifacts, sculptures. and paintings. Among the artists are Georgia O 'Keeffe and Norman Rockwell. The exhibit closed April 4, 2018 but there is still a video on the website. The website also talks about the history phillidelphia and what it has to do with the war effort. The artwork itself is beautiful an is very deatailed.

MLA Citation: World War 1 and American Art: Philadelphia's unsung contributions. Jakegibbonscom. November 17, 2017. Temple University Multimedia Storytelling
https://tustorytelling.com/2016/11/17/world-war-i-and-american-art-philadelphias-unsung-contributions/

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Here is a photo of a yellow and blue cross.
Here is a link so you can learn more.
https://www.lovettartillery.com/Ammuntion_7,7cm_lFK_.htm

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Below is the blueprints of a Blue Cross. The Blue Cross is similar  to the  Yellow Cross but it contains dinphenyl chloroarisine.  The artillery was called blue Cross because they were marked with a blue cross.This type of artillery was used to cause sneezing, coughing, and tightness of the chest. This weapon was supposed to make enemies drop their gas masks and breathe the toxic green cross shells. The Blue Cross shells didn't work so well because the particles couldn't penetrate the gas masks. One advantage to the Blue Cross was that they were indistinguishable from the exploding bomb shells, so the enemies could not adjust their mask in time.

MLA Citation: " Yellow Cross: the advent of mustard gas". Simon Jones. Febuary 4, 2014. Simon Jones Historian.
https://simonjoneshistorian.com/2014/02/04/yellow-cross-the-advent-of-mustard-gas-in-1917/

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Below is a picture of the blueprints of a Yellow Cross. Yellow Crosses were artilery that was used to carry mustard gas across the field. Over 50,000 shells were made over one night. The shells are called Yellow Cross because they were branded by a Yellow Cross. The effects of the mustard gas was not immediate but was over a 1 hour to 2 hour period. There were over 2,000 casualties and all 4 stations were backed up.  The liquid was held in containers so when the artilery blew up it would go everywhere and enimies would get poisoned

MLA Citation: " Yellow Cross: the advent of mustard gas". Simon Jones. Febuary 4, 2014. Simon Jones Historian.
https://simonjoneshistorian.com/2014/02/04/yellow-cross-the-advent-of-mustard-gas-in-1917/

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Below is a picture of Germans using gas containers . Using gas this way was dangerous and the Germans could easily be killed if the wind simply change. This worked at the battle of Ypres. Since this worked  when  Canadians  broke the line they tried Using the containers but they failed. Canadians learned that urine on a rag created a gas mask. The Canadians fought on and stemmed the German wave. Later the british used bicarbonate soda on cotton pads to neutralize the gas.

MLA Citation:
" Dying splendor of the old world" Date unknown. greatwar-1914s. Tumblr
https://greatwar-1914.tumblr.com/post/163055580131/poison-gas-gas-gas-quick-boysan-ecstasy-of/amp

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Below is a gas mask which was used back in WW1.  Gas masks had been used before from miners to plague doctors. When bio warfare started appearing the mask needed to be changed so that soldiers and civilians don't die or be in pain.
This type of mask was first used after the battle of Ypres (April 22, 1915) when soldiers had to cover their mouths or use rags soaked in urine. This type of mask is called the P-helmet. This specific mask was worn by the Vicar of  Eastman. Looks creepy, right?

MLA Citation:
"Life saving history: WW1 Gas Mask"  Worcestershire Museum. 2019. Word press
https://researchworcestershire.wordpress.com/2019/11/01/life-saving-history-world-war-one-gas-mask/