▁at ▁frequencies ▁in ▁the ▁G Hz ▁region . ▁Nan or ib b ons ▁of ▁C d S ▁show ▁a ▁net ▁cool ing ▁due ▁anni h ilation ▁of ▁ph on ons , ▁during ▁anti - Sto kes ▁lum ines c ence ▁at ▁~ 5 1 0   nm . ▁As ▁a ▁result , ▁a ▁maximum ▁temperature ▁drop ▁of ▁ 4 0 ▁and ▁ 1 5 ▁K ▁has ▁been ▁demonstrated ▁when ▁the ▁nan or ib b ons ▁are ▁p ump ed ▁with ▁a ▁ 5 1 4 ▁or ▁ 5 3 2   nm ▁las er . ▁ ▁App lications ▁ ▁P ig ment ▁ ▁C d S ▁is ▁used ▁as ▁p ig ment ▁in ▁pl ast ics , ▁showing ▁good ▁thermal ▁stability , ▁light ▁and ▁weather ▁fast ness , ▁chemical ▁resistance ▁and ▁high ▁opacity . ▁As ▁a ▁p ig ment , ▁C d S ▁is ▁known ▁as ▁cad m ium ▁yellow . ▁( CI ▁p ig ment ▁yellow ▁ 3 7 ) ▁About ▁ 2 0 0 0 ▁tons ▁are ▁produced ▁ann ually ▁as ▁of ▁ 1 9 8 2 , ▁representing ▁about ▁ 2 5 % ▁of ▁the ▁cad m ium ▁processed ▁commer cially . ▁ ▁Historical ▁use ▁in ▁art ▁The ▁general ▁commercial ▁avail ability ▁of ▁cad m ium ▁sul f ide ▁from ▁the ▁ 1 8 4 0 s ▁led ▁to ▁its ▁ad option ▁by ▁artists , ▁not ably ▁Van ▁G og h , ▁Mon et ▁( in ▁his ▁London ▁series ▁and ▁other ▁works ) ▁and ▁Mat isse ▁( B athers ▁by