请问色差分析和色牢度的区别

请问哪位大侠知道色差分析和色牢度的区别？例如下面的条件是做气体腐蚀以后这是做色牢度还是色差分析？样品是USB接头
1.0PurposeofTest
ThisMOVdescribeshowtopreparesamplesformixedflowinggastestingperformedatcertifiedlabs.It
alsocontainstheparametersforeachtest
4.0EquipmentRequired
Gaschamber
Colorimeter
5.0Setup/TestConditions
5.1Samplesaretobelargeenoughtobeplacedintothecolorimetryequipment(Approximately.5”
diameter,flat,andthickenoughtobeopaque).
5.2Thenumberofsamplesrequiredisatleast5perrawmateriallot.
5.3AllowsamplestoreachsteadystateconditionsperEIA364-65oralternativelyIEC68-2-60or
AATCCTestMethod23-1994.
6.0Procedure
6.1Createcolorbaselinewithcolorimeterinaccordancewiththeappropriateilluminationstandards
(indoortungstenlighting,indoorfluorescentlighting,andoutdoorlighting)
6.2FollowtestproceduresperEIA364-65,ClassIIIAoralternativelyIEC68-2-60,Method4or
AATCCTestMethod23-1994.
7.0Pass/Fail,AnalysisCriteria
Alltests–ColorshiftofΔE>3.0constitutesfailure.Thiscanbeoverriddenthroughavisualinspection
innormallightasdeterminedbytheappropriateQualityEngineer.Thisstipulationmayresultin
anitemthathasacolorshiftofΔE>3.0topassthetestandconversely,anitemthathasacolor
shiftofΔE