Bastion Humidity Guard — 2 pack

Description

Cardboard warps and foils separate when humidity swings. Two rechargeable silica cartridges sized to sit in a storage box or cabinet drawer and hold it near 45% relative humidity — dry enough to stop mould and cockling, not so dry that stock goes brittle. An indicator window turns from blue to pink when a cartridge is saturated; two hours in a low oven resets it. Good for years.