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case rims on rimmed cartridges

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https://forums.accuratereloading.com/eve/forums/a/tpc/f/2511043/m/1121091712

07 January 2016, 16:17
shootaway
case rims on rimmed cartridges
When I compare Norma cases to Hornady I see that the rim on the Norma case has that darker rainbow like color you find on the necks of new cartridges.I think that this color comes from annealing.Are the Norma case rims annealed? If so why is this so?