▁transition ▁room ▁on ▁the ▁way ▁to ▁the ▁green / stage . ▁Techn ical ▁staff ▁at ▁some ▁West ▁End ▁the at res ▁( such ▁as ▁the ▁London ▁Col ise um ) ▁still ▁refer ▁to ▁the ▁stage ▁as ▁the ▁green . ▁ ▁Another ▁theory ▁is ▁that ▁the ▁room ▁was ▁originally ▁painted ▁green ▁to ▁" rel ieve ▁the ▁eyes ▁from ▁the ▁g lare ▁of ▁the ▁stage ." ▁On ▁the ▁other ▁hand , ▁early ▁stage ▁light ing ▁was ▁by ▁cand le light ▁and ▁later ▁by ▁gas light , ▁so ▁the ▁" g lare " ▁might ▁well ▁be ▁ap oc ry phal , ▁a ▁modern ▁reference ▁to ▁bright ▁electric ▁stage ▁light ing . ▁It ▁is ▁sometimes ▁said ▁that ▁the ▁term ▁green ▁room ▁was ▁a ▁response ▁to ▁lim el ight , ▁though ▁the ▁name ▁is ▁merely ▁a ▁coinc idence ▁– ▁" lim el ight " ▁refers ▁to ▁calci um ▁ox ide , ▁not ▁to ▁the ▁fruit ▁or ▁colour . ▁Furthermore , ▁lim el ight ▁was ▁invent ed ▁in ▁ 1 8 2 0 ▁and ▁the ▁term ▁" green ▁room " ▁was ▁used ▁many ▁years ▁prior ▁to ▁that . ▁ ▁It ▁is ▁possible ▁that ▁" green ▁room " ▁might ▁be ▁a ▁cor ruption ▁of ▁scene ▁room , ▁the ▁room ▁where ▁scen ery ▁was ▁stored ▁which ▁double d ▁as ▁the ▁actors ' ▁waiting ▁and ▁warm - up ▁room . ▁ ▁Many ▁actors ▁experience ▁nerv ous ▁anx iety ▁before ▁a ▁performance ▁and ▁one ▁of ▁the ▁sympt oms ▁of ▁nerv ous ness ▁is ▁n ause a . ▁As ▁a ▁person ▁who ▁feels ▁n