▁license es ▁of ▁Cont ra ▁V ision ▁Ltd ▁such ▁as ▁ 3 M , ▁A very ▁D enn ison ▁and ▁Cont inental ▁Graphics . ▁ ▁See - through ▁graphics ▁as ▁a ▁product ▁category ▁was ▁recognized ▁on ▁the ▁Tra v elling ▁Museum ▁of ▁British ▁in vention . ▁The ▁windows ▁of ▁the ▁bus ▁were ▁wrapped ▁in ▁see - through ▁graphics ▁and ▁the ▁product ▁was ▁one ▁of ▁a ▁hundred ▁British ▁innov ations ▁which ▁were ▁show c ased ▁inside . ▁See - through ▁graphics ▁was ▁also ▁recognized ▁by ▁the ▁Design ▁Council ▁as ▁a ▁best ▁of ▁British ▁Mill en ni um ▁product . ▁ ▁Production ▁▁ ▁See - through ▁graphics ▁are ▁most ▁commonly ▁produced ▁on ▁large ▁format ▁printer s ▁using ▁sol vent ▁in k jet ▁or ▁u v ▁print ▁technology . ▁Material ▁comes ▁on ▁roll s ▁typically ▁up ▁to ▁ 1 . 5 3 m ▁wide ▁and ▁ 5 0 m ▁long . ▁The ▁material ▁has ▁an ▁ad hes ive ▁back ▁which ▁allows ▁it ▁to ▁be ▁fitted ▁to ▁the ▁exterior ▁of ▁windows . ▁ ▁Several ▁manufact ur ers ▁produce ▁different ▁gr ades ▁of ▁one - way - vision ▁film . ▁An ▁ 8 0 : 2 0 ▁has ▁ 8 0 % ▁material ▁and ▁ 2 0 % ▁hole ▁and ▁is ▁best ▁for ▁ret ail ▁windows ▁where ▁the ▁light ▁inside ▁the ▁building ▁may ▁well ▁be ▁br ighter ▁than ▁the ▁outside ▁at ▁certain ▁times . ▁At ▁the ▁other ▁end ▁of ▁the ▁scale ▁Transport ▁For ▁London ▁( TF L ) ▁specify ▁that ▁a ▁ 5 0 : 5 0 ▁One