ide ▁dissol ved ▁in ▁a que ous ▁am mon ia / s od ium ▁hydro x ide ). ▁At ▁first , ▁the ▁cu pr am mon ium ▁ray on ▁was ▁used ▁as ▁inc and es cent ▁fil ament ▁in ▁light ▁bul b ▁production . ▁An ▁improved ▁process ▁ref ined ▁the ▁first ▁rough ▁and ▁une ven ▁fil ament ▁to ▁increase ▁its ▁strength ▁and ▁el astic ity . ▁This ▁would ▁enable ▁the ▁spin ning ▁of ▁a ▁material ▁that ▁compared ▁to ▁sil k . ▁In ▁ 1 8 9 7 , ▁F rem ery ▁and ▁Urban ▁applied ▁for ▁a ▁pat ent ▁for ▁their ▁method . ▁In ▁the ▁history ▁of ▁the ▁text ile ▁industry , ▁the ▁so - called ▁" Pa uly ▁Pat ent " ▁is ▁considered ▁as ▁the ▁beginning ▁of ▁German ▁ray on ▁production . ▁Although ▁bul b ▁production ▁was ▁dis cont in ued ▁in ▁ 1 9 0 2 , ▁ray on ▁production ▁advanced ▁on ▁an ▁industrial ▁scale . ▁ ▁Verein igte ▁Gl anz stoff - F ab ri ken ▁AG ▁▁ ▁In ▁ 1 8 9 9 ▁Verein igte ▁Gl anz stoff - F ab ri ken ▁AG ▁with ▁headquarters ▁in ▁El ber feld ▁was ▁founded . ▁Event ually ▁the ▁Berg ische ▁trim ming ▁and ▁bra iding ▁industry ▁with ▁its ▁" Bar mer ▁Articles " ▁became ▁the ▁most ▁important ▁bu yer ▁of ▁Ober bru ch ▁ray on . ▁As ▁early ▁as ▁ 1 9 0 0 , ▁a ▁hall ▁accommod ating ▁ 1 8 ▁spin ning ▁machines ▁opened . ▁For ▁the ▁first ▁time ,