Designation:D1684−07(Reapproved2020)StandardPracticeforLightingCottonClassingRoomsforColorGrading1ThisstandardisissuedunderthefixeddesignationD1684;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONUntil1940,practicallyallcottonclassingwasdoneindaylight,muchofitinspeciallyskylightedroomsdesignedtoprovidesufficientanduniformlightingontheclassingtables.CottonclassificationorclassingistheartandscienceofdescribingthequalityofcottonaccordingtotheofficialstandardsoftheUnitedStates.Gradeisdividedintotwocategories–colorgradeandleafgrade.Becausecolorgradeisanimportantqualityfactorinestablishingthepriceanduseofcotton,thecolorqualityoflightingisimportant.Thecottonclasserattemptstoclasscottononthebasisofthecolorthesampleandthestandardwouldhaveindaylight.Inclassingrapidlyhereferstophysicalstandardsonlyoccasionallyeachday;thereforeitismostimportantthatthelightinginaclassingroomshallnotonlyprovideaconstantcolorbutthatitshallmakethecolorofcottonappearasnearlyaspossibleasitwouldindaylightsothathecantakefulladvantageoftrainingandmemory.IntheUSA,daylightatabout7500Kiswhatthecottonclasser(1-3),2(aswellascolormatchersinotherindustries(4-6))hasfoundinpracticetobetheminimumcolortemperatureofpreferreddaylight.1.Scope1.1ThispracticecoverspracticesingeneraluseintheUnitedStatesforlightingcottonclassingrooms,providesgeneralbackgroundinformationregardingthedevelopmentandestablishmentofthesepractices,andprescribesatestmethodforappraisingthecolorqualityoflampsprocuredforthispurpose.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.3Thisinternationalstandardwasdevelopedina...
