▁ge ographic ▁information ▁systems . ▁L ines ▁produced ▁by ▁manual ▁scri bing ▁are ▁sharp , ▁clear ▁and ▁even . ▁▁ ▁An ▁impression ▁of ▁the ▁corrected ▁compilation ▁sheet ▁is ▁photograph ed ▁onto ▁scri be ▁sheet ▁material ▁or ▁drawn ▁using ▁p enc il . ▁While ▁working ▁over ▁a ▁light ▁table , ▁lines ▁on ▁the ▁scri be ▁sheet ▁are ▁trac ed ▁with ▁a ▁metal ▁or ▁sa pp hire - ti pped ▁scri be ▁tool ▁to ▁remove ▁thin ▁lines ▁of ▁transl uc ent ▁co ating ▁to ▁produce ▁a ▁hand made ▁negative ▁image . ▁This ▁comp ares ▁with ▁draft ing , ▁where ▁an ▁in k ▁image ▁is ▁made ▁on ▁trac ing ▁paper ▁by ▁depos iting ▁in k ▁using ▁a ▁pen ▁to ▁produce ▁a ▁positive ▁image . ▁S cri bing ▁produces ▁a ▁result ▁superior ▁to ▁draft ing , ▁but ▁is ▁more ▁time - consum ing . ▁ ▁The ▁scri be ▁sheet ▁is ▁made ▁of ▁a ▁stable ▁pl astic ▁base ▁material ▁and ▁co ated ▁with ▁a ▁material ▁which ▁is ▁designed ▁for ▁easy ▁removal ▁using ▁a ▁scri bing ▁tool ▁to ▁produce ▁a ▁clean ly ▁cut ▁line . ▁Vari ous ▁colours ▁are ▁used , ▁and ▁orange ▁is ▁said ▁to ▁produce ▁the ▁least ▁eye - stra in ▁for ▁the ▁cart ograph er . ▁ ▁One ▁scri be ▁sheet ▁is ▁produced ▁for ▁each ▁map ▁colour . ▁Cor re ctions ▁can ▁be ▁made ▁by ▁" du ff ing " ▁( re - co ating ) ▁the ▁scri be ▁sheet ▁with ▁special ▁du ff ing ▁liquid . ▁The ▁detail ▁can ▁then ▁be ▁re - scri bed