Brand name use to be Goldenrods. They work well and never had any damage. Now I use a dehumidifier in a enclosed gun room.

I have two cheap metal cabinets filled with klunkers and deactivated guns that have goldenrods in them that sit in semi plain view. These cabinets, safes if you wish, are filled with decoy guns so thieves find some guns and stop searching. If lost they are of no great value and not a danger to others unless used as a club. All are missing firing pins or other key parts.