▁Company , ▁using ▁the ▁tra dem ark ed ▁name ▁H I - L IT ER . ▁A very ▁D enn ison ▁Corporation ▁now ▁own s ▁the ▁brand , ▁having ▁acquired ▁Carter ' s ▁In k ▁Company ▁in ▁ 1 9 7 5 . ▁ ▁St yles ▁ ▁Many ▁high l igh ters ▁come ▁in ▁bright , ▁often ▁flu ores cent ▁and ▁v ibr ant ▁colors . ▁Being ▁flu ores cent , ▁high l ighter ▁in k ▁g low s ▁under ▁black ▁light . ▁The ▁most ▁common ▁color ▁for ▁high l igh ters ▁is ▁yellow , ▁but ▁they ▁are ▁also ▁found ▁in ▁orange , ▁red , ▁p ink , ▁pur ple , ▁blue , ▁and ▁green ▁vari eties . ▁Some ▁yellow ▁high l igh ters ▁may ▁look ▁green ish ▁in ▁colour ▁to ▁the ▁n aked ▁eye . ▁Y ellow ▁is ▁the ▁preferred ▁color ▁to ▁use ▁when ▁making ▁a ▁phot oc opy ▁as ▁it ▁will ▁not ▁produce ▁a ▁shadow ▁on ▁the ▁copy . ▁Yet , ▁the ▁use ▁of ▁different ▁colour ▁high l igh ters ▁simultaneously ▁can ▁system atically ▁make ▁information ▁even ▁more ▁organized ▁and ▁readable ▁and ▁in ▁high ▁contrast . ▁ ▁High l igh ters ▁are ▁available ▁in ▁multiple ▁forms , ▁including ▁some ▁that ▁have ▁a ▁ret ract able ▁felt ▁tip ▁or ▁an ▁er aser ▁on ▁the ▁end ▁opposite ▁the ▁felt . ▁Other ▁types ▁of ▁high l igh ters ▁include ▁the ▁tr il ighter , ▁a ▁tri angular ly - sh aped ▁pen ▁with ▁a ▁different - col oured ▁tip ▁at ▁each ▁corner , ▁and