▁space craft . ▁However , ▁they ▁are ▁expensive ▁and ▁their ▁production ▁and ▁use ▁has ▁been ▁greatly ▁cur ta iled ▁due ▁to ▁their ▁effect ▁as ▁o zone - de ple ting ▁agents . ▁They ▁are ▁no ▁longer ▁used ▁in ▁routine ▁fire ▁ex ting u ish ers , ▁but ▁retain ▁n iche ▁uses ▁in ▁a eros pace ▁and ▁military ▁automatic ▁fire - supp ression ▁applications . ▁They ▁include ▁b rom och lor om eth ane ▁( H al on ▁ 1 0 1 1 , ▁CH 2 Br Cl ), ▁b rom och lor od if lu or om eth ane ▁( H al on ▁ 1 2 1 1 , ▁C Br Cl F 2 ), ▁and ▁b rom ot rif lu or om eth ane ▁( H al on ▁ 1 3 0 1 , ▁C Br F 3 ). ▁ ▁Other ▁uses ▁ ▁Silver ▁b rom ide ▁is ▁used , ▁either ▁alone ▁or ▁in ▁combination ▁with ▁silver ▁ch lor ide ▁and ▁silver ▁i od ide , ▁as ▁the ▁light ▁sensitive ▁constitu ent ▁of ▁phot ographic ▁em uls ions . ▁ ▁Eth yl ene ▁b rom ide ▁was ▁an ▁add itive ▁in ▁gas ol ines ▁containing ▁lead ▁anti - engine ▁knock ing ▁agents . ▁It ▁sc av eng es ▁lead ▁by ▁forming ▁vol atile ▁lead ▁b rom ide , ▁which ▁is ▁exha usted ▁from ▁the ▁engine . ▁This ▁application ▁account ed ▁for ▁ 7 7 % ▁of ▁the ▁b rom ine ▁use ▁in ▁ 1 9 6 6 ▁in ▁the ▁US . ▁This