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S&B and some other makers use colored lacquer, but AFAIK all makers seal the primers. Milspec ammo uses colored sealant so inspectors will know the sealant had been applied; it is no better than clear sealant.
In some military ammuntion, colored primer sealant is used for identification, and the Japanese used colored case mouth sealant for that purpose; pink was for ball ammunition, for example.
Jim
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