note ▁paper . ▁The ▁thread ▁will ▁appear ▁as ▁a ▁dark ▁stri pe ▁when ▁held ▁up ▁to ▁the ▁light . ▁The ▁word ▁" E U RO " ▁and ▁the ▁value ▁is ▁embedded ▁in ▁tiny ▁letters ▁on ▁the ▁thread . ▁ ▁Per for ations ▁in ▁the ▁h olog ram ▁which ▁will ▁form ▁the ▁euro ▁symbol . ▁There ▁are ▁also ▁small ▁numbers ▁showing ▁the ▁value . ▁ ▁A ▁m atted ▁surface ; ▁the ▁note ▁paper ▁is ▁made ▁out ▁of ▁pure ▁cot ton , ▁which ▁feels ▁cr isp ▁and ▁firm , ▁but ▁not ▁lim p ▁or ▁w axy . ▁ ▁Bar codes , ▁ ▁A ▁serial ▁number . ▁ ▁Security ▁features ▁( E uropa ▁series ) ▁ ▁Wat erm ark : ▁When ▁the ▁note ▁is ▁held ▁under ▁a ▁normal ▁light ▁source , ▁a ▁portrait ▁of ▁Europa ▁and ▁an ▁electro type ▁den om ination ▁appear ▁on ▁either ▁side . ▁ ▁Port rait ▁Window : ▁When ▁the ▁note ▁is ▁held ▁against ▁the ▁light , ▁the ▁window ▁in ▁the ▁h olog ram ▁becomes ▁transparent ▁and ▁reve als ▁a ▁portrait ▁of ▁Europa ▁which ▁is ▁visible ▁on ▁both ▁sides ▁of ▁the ▁note . ▁ ▁Port rait ▁H olog ram : ▁When ▁the ▁note ▁is ▁t ilt ed , ▁the ▁h olog ram ▁– ▁the ▁silver - col oured ▁stri pe ▁on ▁the ▁right ▁of ▁the ▁note ▁– ▁reve als ▁a ▁portrait ▁of ▁Europa ▁as ▁well ▁as ▁the ▁" € " ▁symbol , ▁the ▁main ▁image ▁and ▁the ▁value ▁of ▁the ▁bank note . ▁ ▁Emer ald ▁Number : ▁When ▁the ▁note ▁is