ine ▁comp ounds ▁include ▁high - dens ity ▁dr illing ▁flu ids , ▁d yes ▁( such ▁as ▁Ty rian ▁pur ple ▁and ▁the ▁indicator ▁b rom oth ym ol ▁blue ), ▁and ▁ph arma ce ut ical s . ▁B rom ine ▁itself , ▁as ▁well ▁as ▁some ▁of ▁its ▁comp ounds , ▁are ▁used ▁in ▁water ▁treatment , ▁and ▁is ▁the ▁prec ursor ▁of ▁a ▁variety ▁of ▁in organ ic ▁comp ounds ▁with ▁an ▁enorm ous ▁number ▁of ▁applications ▁( e . g . ▁silver ▁b rom ide ▁for ▁phot ography ). ▁Z inc – b rom ine ▁batter ies ▁are ▁hy brid ▁flow ▁batter ies ▁used ▁for ▁station ary ▁elect rical ▁power ▁backup ▁and ▁storage ; ▁from ▁household ▁scale ▁to ▁industrial ▁scale . ▁ ▁Bi ological ▁role ▁and ▁to x icity ▁ ▁A ▁ 2 0 1 4 ▁study ▁suggests ▁that ▁b rom ine ▁( in ▁the ▁form ▁of ▁b rom ide ▁ion ) ▁is ▁a ▁necessary ▁c of actor ▁in ▁the ▁b ios yn thesis ▁of ▁col lagen ▁IV , ▁making ▁the ▁element ▁essential ▁to ▁bas ement ▁memb rane ▁architecture ▁and ▁t issue ▁development ▁in ▁animals . ▁Nevertheless , ▁no ▁clear ▁dep riv ation ▁sympt oms ▁or ▁synd rom es ▁have ▁been ▁documented . ▁In ▁other ▁bi ological ▁functions , ▁b rom ine ▁may ▁be ▁non - ess ential ▁but ▁still ▁benef icial ▁when ▁it ▁takes ▁the ▁place ▁of ▁ch lor ine . ▁For ▁example , ▁in ▁the ▁presence ▁of ▁hydro gen ▁per ox ide , ▁H 2 O