Restoration of a Semi-Relic WWII German M42 Helmet

[WarPig1976]

Why did the Germans put Aluminum Oxide on the helmet and not just paint them??

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[peregrinvs]

Why did the Germans put Aluminum Oxide on the helmet and not just paint them??

To make them less reflective. Pre / early war helmets had a smooth paint finish which was unhelpfully reflective.