Concerning thearcheologicalsamples,thespectraadjustments
aredifferentbetweentheinternalpartandthealteredsurface
part. Inageneralway,fortheexternalsamples,thebandsget
broader(W is higherforthesurfacesamples),theirprofile tends
towardsaGaussianone;andsomebands' intensity decreases
significantly.Bandnumber10almostdisappearsforsomearche-
ological copals(theredones).ItisrelatedtoCHbondsinvinyl
groups whichmaybetransformed(oxidized)duringalteration
processes [41].