Put HUMI-CARE in your humidifier to ensure the protection of your priceless handcrafted items. Propylene glycol and distilled water are combined in a precise 50/50 ratio to produce a gradual, constant release of 70% humidity. It’s simple and really effective. Additionally, the cost-effective 16oz bottles give you a lot of value for your money! Another fantastic product to the HUMI-CARE collection.