Chlorine. The Germans first used it. It moved over the battlefield like a green/white mist and it burned the eyes and lungs of those who got caught in it. Soldiers survived it by urinating into their handerchiefs and holding them over their noses, not pleasent but better than dying.
Chlorine
The gaseous element chlorine has a greenish tint. Chlorine bleach is an aqueous solution of sodium hypochlorite. Chlorine solutions are used to disinfect water in public water systems, and calcium hypochlorite powder is added to swimming pools to control bacteria.
Bleach typically turns a greenish-yellow color when tested with universal indicator due to its high pH level. This indicates that bleach is a strong base.
used as a heavy greenish-yellow diatomic gas of pungent odor and is used especially as a bleach, oxidizing agent, and disinfectant in water purification
Yellow and blue can be combined together to make the greenish color. Also, yellow and dark, green can create that "greenish color."
Chlorine in its elemental form is a greenish-yellow gas. However, when it is dissolved in water as chlorine gas, it gives the water a yellow-green color. In a solution such as bleach, chlorine appears as a pale yellow or yellow-green color.
greenish yellow
Citron
Citron
brownish yellow or greenish yellow.
Chlorine gas is yellow. It was used in one of the world wars and was referred to as Mustard Gas due to its yellowish color.
Yellow and green makes greenish-yellow.